The catalog is full of nasties, including a cellular jammer that will kill mobile service if the cops decide that the people in their vicinity shouldn’t be able to get the word out about what’s going on; Stingray-alikes that let cops harvest the identities of people at a given time and place, and trackers for cellphones that let cops follow someone based on their phone’s unique radio identifiers.

Source: Leaked catalog from UK surveillance arms-dealer full of gadgets sold to US cops