Devices used to block wireless calls can also disrupt alarm signals
Alarm signals also can be intentionally jammed, as was the case in 2009 when thieves stole $2.3 million from a Brink’s warehouse in Columbus, Ohio. One of the men convicted in the case testified that two of the thieves cut holes in the roof, used a cellphone jammer to disrupt the alarm system and then drilled through a vault door. Last summer, thieves used a jammer to help them steal $74,000 worth of designer sunglasses from a store in Orange County, Fla.
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