Police Magazine Logo
MenuMENU
SearchSEARCH

Metal Detectors: Recovering Evidence with Technology

Usually, objects being sought have been silted over, or, in time, have settled into the soft bottom where they become obscured from view. Without the aid of a metal detector, the diver must physically probe the bottom using his hands to feel for objects.

June 1, 2022
Metal Detectors: Recovering Evidence with Technology

Divers use a Pulse 8X metal detector underwater.

Credit:

PHOTO: JW Fishers Mfg., Inc.

4 min to read


On a spring afternoon a call comes in to dispatchers reporting an armed robbery at a local bank. The suspects have fled and the last seen in a truck heading across the river over the I-88 bridge. Police cannot find the suspects, but a key witness says they saw someone in a truck throw something into the river.

Could it be the gun used for the robbery? Could it be the stolen merchandise from the bank? Despite sounding like a scene from a movie, similar events that occur somewhere across the globe multiple times a day. In 2021 there were over 60,000 armed criminal acts performed and amongst those over 32% of the weapons are not found on the criminal upon capture.

Ad Loading...

A metal detector serves as an invaluable tool in the search for and recovery of missing, metallic evidence. This evidence can range from shotguns and handguns to ammunition and knives. As technology advances it’s not only firearms that are now being used in crimes. In today’s modern age cell phones are a massive, crime related item actively being sought by investigators on scene. Phones can be essential to recover since they may contain multiple sources of information that could lead investigators down the right path to solving a case.

The Pulse 8X is the perfect tool to help locate that missing evidence. JW Fishers Mfg., Inc has been a leading producer of metal detectors for police, sheriff departments, government agencies and dive rescue teams. The company’s Pulse 8X is the “go to” metal detector for those who want a commercial detector that can handle the rigors of police and underwater searching on a constant basis with a detection area unsurpassed in the industry. The Pulse 8X was rated the #1 underwater metal detector rated by The Department of US Homeland Security.

In 2014 the Orange County (CA) Sheriff’s Department (OCSD) established a metal detector search team. The agency made important considerations regarding equipment selection and the development of training for metal detector use – one detector being the Pulse 8X.

According to the SRRU “a key feature to consider for ground-search metal detectors is the availability of different sized search coils. One size coil does not fit all. For most searches, the default choice is the largest coil available for the unit. Such a coil provides the greatest coverage per sweep and the best depth penetration. In some cases, though, the terrain may not allow a large coil to get close to the ground. For these situations, users need a smaller coil.”

The Pulse 8X offers 7 different coil sizes, with the smallest one being 5” in circumference all the way to an 8” x 48” towable coil that is used topside on a vessel while towing the coil on the water floor.

Ad Loading...

Nassau County, NY, uses the Pulse 8X on their water-based operations. According to their website, “the underwater metal detector assists the search and recovery diver by enabling him to detect metal objects beneath any substrate under water. Usually, objects being sought have been silted over, or, in time, have settled into the soft bottom where they become obscured from view. Without the aid of a metal detector, the diver must physically probe the bottom using his hands to feel for objects. Depending on the size of an object, the metal detector can scan and detect deeply below the surface. Quite often, underwater evidence searches involve guns which can be easily detected by a metal detector. The recovery of evidence that may have been thrown in the water is critical to many investigations, and often leads to the apprehension of the perpetrator involved. An assignment to recover evidence is just one of the many tasks performed by an underwater search and recovery police diver.”

As modern technology advances the one thing that will always remain stable is the need for metal detectors and those talented individuals that use them every day. JW Fishers has been providing underwater search equipment across the globe for over 55 years and always have the “right tool for the job.”

More Patrol

Police officer in a darkened hallway holding a flashlight and headline 5 Things to Know When Buying Patrol Lights, and POLICE logo.
PatrolApril 16, 2026

5 Things to Know When Buying Patrol Lights

Whether it’s time to buy a personal patrol light or make the decision for the next department-issued patrol light, what do you need to know? How do you weigh the different variables and make the best choice?

Read More →
Group of men and women seated in a circle around a room as one woman stands and leads discussion.
PatrolApril 9, 2026

Warriors Heart’s Mission to Serve America’s Veterans and First Responders

Warriors Heart works closely with federal and community partners to expand treatment options for veterans and first responders. By combining specialized clinical care with a peer-driven recovery environment, the program helps warriors rebuild strength, restore relationships, and rediscover purpose.

Read More →
Black background with police card lights and logo for POLICE, with headline in yellow: How are LE Boots Different for Women
Patrolby Wayne ParhamApril 9, 2026

How are LE Boots Different for Women?

Boots fit differently for men and women, so how are law enforcement boots for women designed differently from those worn by men? In this video, Kyle Ferdyn, of Garmont Tactical, shares all the details.

Read More →
Ad Loading...
Man standing in desert talking on radio.
PatrolApril 9, 2026

Motorola Solutions Extends Resilient, Mission-Critical Communications and AI with T-Satellite from T-Mobile

A collaboration between Motorola Solutions and T-Mobile helps deliver uninterrupted situational awareness and access to AI wherever the mission leads, enabled by satellite connectivity for Motorola Solutions' APX NEXT smart radios.

Read More →
Las Vegas skyline at dusk with headline 2026 Vision FirstNet Users Summit, dates for the event, and diagonally at bottom right words Registration Open.
PatrolApril 9, 2026

Registration Now Open for 2026 Vision FirstNet Users Summit

Registration is now open for the 2026 Vision FirstNet Users Summit. The Summit is an opportunity to connect with local and federal leaders, specifically the FirstNet Authority, which is hosting a track at the event this year.

Read More →
Two chest rig packs in camo in front of a blue themed SWAT background and a logo for Tasmanian Tiger.
PatrolApril 6, 2026

Tasmanian Tiger Launches Modular Chest Rig 4xM4 & Modular Chest Rig Pack for LE

Tasmanian Tiger has expanded its Modular Load-Carrying System with the new Modular Chest Rig 4xM4 and Modular Chest Rig Pack. Both provide adaptable, low-profile load options for military, law enforcement, and SWAT missions.

Read More →
Ad Loading...
Security worker watching computer monitors, with a white area at top with a logo for ZeroEyes.
PatrolApril 2, 2026

ZeroEyes Expands from AI Gun Detection to Knife Detection & Suspect Tracking

ZeroEyes has launched three new product categories to extend beyond firearms to address additional acute safety threats and basic security needs. Knife detection and suspect tracking are now also available.

Read More →
GALLS logo against a white box set atop a blue-tinted map of Tennessee.
PatrolApril 2, 2026

GALLS Acquires CMS Uniforms

GALLS has acquired CMS Uniforms and Equipment, Inc., a prominent regional provider based in Nashville, Tennessee. CMS Uniforms, founded in 2000, has built a reputation for delivering stellar customer service and managing complex uniform programs for more than 670 accounts.

Read More →
Police drone hovering over its charging nest against a blue sky background.
PatrolMarch 26, 2026

Brinc Unveils Guardian, Launching the Next Era of Drone as First Responder

Brinc’s new Guardian delivers 24/7 operations, Starlink connectivity, and a robotic charging nest that can swap batteries and change payload configurations without human intervention.

Read More →
Ad Loading...
image of trooper, shown from waist down, standing beside a police cruiser along the road and at right a headline Slow Down Move Over.
PatrolMarch 19, 2026

Colorado State Patrol Releases 2025 Struck-By Analysis

The Colorado State Patrol, after analyzing its 2025 struck-by incidents, identified one area for improvement: using traffic cones to provide advanced warning before the cruiser's location. Here is the agency’s final data.

Read More →