Which item is used to block cellular or radio signals during evidence collection?

• A. Grounding Bracelets
• B. Phone Jammers
• C. Electro-Static Evidence Bags
• D. Photographs

Answer: (B)

Blocking wireless signals during evidence collection relies on creating an area where devices cannot communicate with networks or receive remote commands. A phone jammer is designed to emit interference that disrupts cellular and other wireless transmissions, effectively silencing devices in the vicinity. This makes it the best option for preventing remote access, data transmission, or remote wiping while the evidence is secured.

Grounding bracelets serve to safely discharge static electricity; they don’t affect radio signals. Electro-Static Evidence Bags protect evidence from static buildup and contamination but aren’t intended to block communication signals. Photographs document the scene and have no role in interfering with wireless networks.

Note that using jammers is regulated in many jurisdictions and typically requires authorization; alternative methods like Faraday containment can block signals without emitting interference.