Walk-Through Detectors in Your Event Security Plan: The Complete Venue Operator’s Guide to Weapons Screening

A walk-through metal detector, also called a magnetometer or portal detector, generates an electromagnetic field across an archway and measures the disturbance caused by metallic mass passing through it. What separates venue-grade equipment from a hardware-store archway is what happens after that disturbance is measured.

Multi-Zone Detection and Venue Firearm Detection

CISA’s Public Venue Security Screening Guide draws the distinction that matters for venue weapon detection: single-zone detectors tell a screener only that an anomaly exists somewhere on the body. Multi-zone detectors use multiple transmit and receive elements to show the screener where on the body the signal originated.

At an event, that difference is measured in seconds per guest. A single-zone alarm means a full secondary screen. A multi-zone alarm means a screener goes directly to the left hip. Across 20,000 attendees, that is the difference between a gate that clears and a gate that backs up.

Venue-grade CEIA walk-through detectors, including the HI-PE Plus, PMD2 Plus Elliptic, and SMD600 Plus, use 60 detection zones (20 vertical × 3 lateral) to localize metallic mass precisely, and are engineered to discriminate genuine venue firearm detection and handgun detection events from the belt buckles, keys, coins, and phones that every crowd carries.

The Standard That Actually Matters: ASTM F3566-22

Most vendors still cite NIJ Standard-0601.02 (2003). It remains widely referenced and it is a real standard, but venue buyers should know its current status.

In its September 2024 market survey of walk-through weapons screening systems, the DHS Science & Technology Directorate’s National Urban Security Technology Laboratory states directly:

“The ASTM F3566 supersedes the NIJ 0601.02. While some manufacturers continue to cite conformance with NIJ 0601.02, applying it to the evaluation of the performance of a WTMD is not recommended.”

DHS names ASTM F3566-22 as the primary standard useful to public safety organizations in defining weapons-screening requirements. Its baseline acceptable performance:

Traditional Walk-Through Detectors vs. Frictionless Screening

There are now two distinct categories, and the right answer depends on your gate, not on which is newer.

Traditional multi-zone walk-through detectors (HI-PE Plus, PMD2 Plus, SMD600 Plus, Classic) deliver the highest detection sensitivity and the most granular localization. They require guests to divest little or nothing, but bags are handled separately. They are the right choice for controlled entries, permanent installations, high-sensitivity screening, and any venue where detection depth outranks raw speed.

Frictionless weapons detection systems (CEIA OPENGATE) use two open pillars with no archway. Guests walk through at a natural pace without divesting phones, keys, water bottles, tablets, or chargers, and without removing bags or backpacks. The system targets mass-casualty threat items rather than all metal. It is the right choice for high-volume gates, outdoor grounds, temporary perimeters, and any entry where the queue is the risk.

Most large venues end up running both: frictionless at the main gates for volume, traditional multi-zone at credentialed, VIP, and back-of-house entries where sensitivity matters more than speed.

Detector Comparison for Event and Venue Deployment

Passage width, battery life, and standards conformance for OPENGATE as recorded in the DHS S&T NUSTL market survey, September 2024. Multi-zone specifications per CEIA product documentation.

How to Read a Vendor Throughput Claim

Be skeptical of the number on the brochure, including ours. Two federal cautions are worth quoting to any vendor you evaluate:

DHS S&T: “The effects of checkpoint design, operational procedures, number of lanes, divestment requirements, and other such site-specific considerations… yield an ‘effective throughput’ for security screening at a particular location or venue that is lower than the maximum rate.” DHS further calls specifications phrased as “2-3 times the throughput of conventional detectors” “imprecise and difficult to interpret.”

NCS4: “Advertised throughput rates may not be accurate when factoring in additional conditions.”

This is not a marginal concern. In November 2024 the Federal Trade Commission took action against Evolv Technologies, alleging the company misrepresented its screening system’s ability to detect weapons, ignore harmless items, and cut labor costs by 70% versus metal detectors. The resulting order bars unsupported claims about detection, accuracy, speed, and labor cost.

Three questions that separate a real number from a marketing number:

1. At what detection probability? A throughput figure without a paired detection rate is meaningless. ASTM F3566-22 binds them: ≥3,000/hr at ≥95% detection.
2. Measured how, and by whom? Manufacturer-stated maximums, third-party verified results, and observed field deployments are three different things. ASTM is standing up a conformity assessment program under F3356-19a with published verified-product listings and annual re-testing. Ask whether a product appears on it.
3. What divestiture assumption is baked in? A rate measured with empty pockets and no bags will not survive contact with a concert crowd.

GXC will give you a modeled effective throughput for your specific gate configuration (lanes, staffing, divestiture policy, and arrival curve), not a brochure maximum.

This is the question every event security plan needs to answer numerically, and the one most plans answer by guessing.

The Lane Math

Lane Segmentation

DHS/CCICADA’s published recommendation 1.2.9: “Segmenting patrons can enable better utilization of resources and decrease average waiting time,” specifically by routing guests with no bags through a separate, faster, lower-staffed lane.

Practical segmentation for events:

• No-bag express lanes: the single highest-yield change at most venues
• Credentialed staff, vendor, and production lanes: screened separately at lockdown per league policy
• VIP and backstage lanes: higher sensitivity, lower volume
• Accessible / secondary screening lanes: required, not optional (see ADA below)
• Re-entry lanes: distinct from first-entry, with different alarm-resolution expectations

Placement matters as much as count. CISA directs venues to “place WTMD locations in an area where individuals will encounter them before arriving at the venue entrance locations, when possible,” which pushes the screened boundary away from the building, and to site them where they are well lit, sheltered from the elements, adequately powered, and sufficiently distant from metal gates to maintain the integrity of screening results.

Stadiums and Arenas

Weapon detection for stadiums is a volume problem before it is a detection problem, and it drives most of the safety technology for arenas budget. Ingress is compressed, arrival curves are steep, and the perimeter is long with multiple gates operating simultaneously.

Priorities: frictionless screening at the main gates to protect the queue; multi-zone walk-through detectors at credentialed, media, VIP, and back-of-house entries; hand-held detectors at every secondary resolution point; and a lane count sized to the steepest gate’s arrival curve, not the venue average. Battery-powered units let you open overflow lanes at gates with no dedicated power run.

Because stadium gates operate outdoors in every weather condition, verify the operating temperature range and environmental rating of anything you deploy. CEIA multi-zone units are rated −4 °F to 149 °F with IP65/IP66 configurations.

[Link 2-3 relevant /venues/ pages contextually here, e.g. Allegiant Stadium, MetLife Stadium, Barclays Center]

Concerts, Festivals, and Outdoor Grounds

Festival grounds have no permanent infrastructure, no power at the perimeter, and a footprint that changes between events. Portability is the governing constraint.

Priorities: battery operation (OPENGATE runs up to 14 hours on battery per DHS’s recorded specification), sub-minute setup with no tools, environmental rating for weather exposure, and a bag policy decided before lane count is set, because whether bags go through the portal or to a separate table changes your throughput by more than any other single variable.

Multi-day festivals should plan for re-entry volume separately. Re-entry is often larger than first entry and is almost always under-resourced.

Theaters, Conference Centers, and Trade Shows

Weapon detection for theaters and conference venues is a footprint and aesthetics problem. Lobbies are narrow, ingress is spread across a longer window, and the guest experience expectation is high.

Priorities: compact form factor and narrow passage width, one-touch setup for venues that screen only on event days, and equipment that stows between events. Trade shows add a distinct wrinkle: exhibitors move large volumes of metal freight through the same doors as attendees, so freight and attendee screening must be separated in both time and space.

“Screening will create lines and ruin the guest experience.”

This is backwards. Bad screening creates lines; correctly sized screening removes them. NCS4 found 87.5% of venues already have lines forming outside the perimeter, which means the status quo is the problem, not the fix. And guests are more supportive than most operators assume: in NCS4’s 2023 survey of 400 spectators, 73% said they prefer visible security measures, and 50.2% favored passing through screening individually. Only 31.6% reported that security procedures negatively affected their experience, a number that falls further with frictionless systems that require no divestiture.

“Frictionless systems are unproven and over-marketed.”

Some of that skepticism is earned. The FTC’s November 2024 action against Evolv Technologies is a matter of public record, and DHS itself warns that vendor throughput multiples are “imprecise and difficult to interpret.” The answer is not to avoid the category. It is to buy on standards rather than claims. Require ASTM F3566-22 conformance, ask for third-party verification, verify DHS SAFETY Act status on the federal register rather than in a press release, and run a live demo before signing.

“We can’t afford it.”

Weigh equipment against the staffing it replaces. Wanding lanes run roughly two to three times slower per patron than magnetometer lanes, which means roughly double the lanes and double the screeners, every event, forever. The CCICADA modeling puts numbers on it: about 40 magnetometer lanes versus roughly 70 wanding lanes for equivalent queue clearance. Rental also changes the equation for venues with seasonal or episodic screening needs; GXC offers both, and the rent or buy calculator will show you the crossover point for your event calendar.

“Guests will just go around it.”

No security measure is absolute, and any vendor who tells you otherwise is one to walk away from. But screening addresses the primary entry vector, and CISA’s guidance closes the flanking argument directly: place detectors so guests encounter them before reaching the venue entrance, so only screened individuals approach the building. Portability means you can screen any door, any gate, any temporary perimeter, and any back-of-house entry, which is precisely where unscreened access actually happens.

“What about guests with pacemakers, implants, or disabilities?”

This is a legitimate operational question with a well-established answer. The ADA prohibits discrimination based on disability in public accommodations and commercial facilities, and CISA directs venues to have screening procedures for special-needs visitors accordingly. Size your accessible lane to the 2010 ADA Standards: 32 inches minimum clear width at a door opening, 36 inches for an accessible route. Be aware that a widely used industry checklist cites 28 inches, which is not an ADA figure. On the medical side, the American Heart Association’s position is that “interactions with metal detectors are unlikely to cause clinically significant symptoms in most patients,” and FDA testing of 20 implanted devices found transient effects in 3 at field strengths comparable to real detectors, with all devices returning to normal within seconds. Full protocol in the next section.

The Support Anti-terrorism by Fostering Effective Technologies (SAFETY) Act of 2002 (6 U.S.C. §§441-444) was enacted because, as DHS puts it, after 9/11 “the private sector expressed considerable reluctance to deploy security technologies and services in civilian settings due to the enormous potential liability risks.” It is administered by the DHS Science & Technology Directorate’s Office of SAFETY Act Implementation, and it is voluntary.

There are two tiers.

Designation provides: liability capped at the amount of insurance DHS requires the seller to carry; exclusive action in federal court; no joint and several liability for non-economic damages; no punitive damages or prejudgment interest; and recovery reduced by amounts received from collateral sources.

Certification, the higher tier, provides all of the above plus a rebuttable presumption that the government contractor defense applies to claims arising out of an act of terrorism, and places the technology on the DHS Approved Products List for Homeland Security.

This matters for equipment selection because it extends beyond hardware. DHS’s approved-technology list includes entire stadium and arena security programs: Gillette Stadium, MetLife Stadium, Yankee Stadium, Madison Square Garden, Levi’s Stadium, Lambeau Field, NRG Stadium, and Soldier Field among them. The technologies inside your screening program are part of what gets evaluated.

ADA and Medical-Implant Accommodation

Build these into your written post orders, not into screener improvisation.

Passage width, and a correction worth knowing. NCS4’s venue evaluation guide asks whether a system “meet[s] the minimum width requirement (28″) specified by the American Disabilities Act.” That 28-inch figure is not an ADA requirement. The 2010 ADA Standards specify a 36-inch minimum clear width for accessible routes (§403.5.1, reducible to 32 inches for a maximum 24-inch length) and a 32-inch minimum clear width at door openings (§404.2.3). Size your accessible screening lane to 32-36 inches, not 28. If a vendor cites the 28-inch figure back to you, they are repeating an error in a widely used checklist.

Secondary screening triggers. CISA specifies that secondary screening should be available for individuals who: alarm and cannot find anything further to divest; have a medical situation such as pregnancy, or an implant such as a pacemaker, defibrillator, or bone stimulator, that leads them to choose not to pass through the detector; are in a wheelchair and cannot walk unassisted; have a prosthetic limb whose removal would be inappropriate; are pushing strollers; cannot fit through the portal; or simply state they do not want to go through the detector for any reason. Note the framing: the implant does not automatically require secondary screening; the guest’s choice does.

Contact technique. CISA’s best practice is to use the back of the hand when patting down sensitive areas, and to ask before beginning whether the guest has any sensitive or painful areas or is wearing an external medical device, using the lightest possible pressure.

Medical safety. The American Heart Association advises patients with cardiac devices not to linger near or lean against a detector and to request alternative screening if preferred. FDA researchers tested 20 personal medical electronic devices (6 pacemakers, 6 ICDs, 5 neurostimulators, 3 insulin pumps) using an FDA-built detector simulator. At field strengths comparable to actual walk-through detectors, interference effects appeared in 3 devices (two pacemakers, one neurostimulator), all transient, with normal function restored within seconds; no effects were seen in ICDs or insulin pumps. At the simulator’s maximum field strength, above what real detectors produce, effects appeared in 6 of the 20. CEIA systems are engineered against active-implant electromagnetic compatibility standards including ISO 14117 and IEEE C95.1-2019.

Refusal. CISA states plainly that “security screening is voluntary; however, refusal to allow screening will result in denial of entry,” and that a separate exit lane should be available for guests who decline. Post visible signage at every screening point, and consult counsel on consent and notice requirements in your jurisdiction.

Documentation That Protects You

If an incident occurs, your plan is evidence. Maintain: the threat and vulnerability assessment with revision dates; the lane model and its assumptions; equipment test logs kept per unit, locally, for the full lifecycle; training records with recurrent-training dates; written post orders for alarm resolution and secondary screening; signage placement records; and post-event debriefs with queue and alarm metrics.

This is also the documentation trail a SAFETY Act application requires, which means building it serves both purposes at once.

Walk-through metal detectors are the backbone of a modern event security plan, but only when the equipment is matched to the gate, the lane count is matched to the arrival curve, and the protocols are matched to the standard.

GXC Inc., the exclusive US distributor of CEIA detection systems, builds that whole package: gate assessment, modeled lane plans, equipment selection against ASTM F3566-22, deployment, staff training, and ongoing support. Our CEIA weapons detection technology and OPENGATE frictionless systems carry DHS SAFETY Act Certification and Designation respectively, verifiable on the federal register, not just in our marketing.

Whether you rent for a single festival or install permanently across a stadium’s gates, our team will help you design screening that protects every attendee without becoming the bottleneck at your front door.