The Department of Homeland Security hosts a website called "Responder Knowledge Base" where it advertises a wide variety of military, law enforcement and first responder tools. Local and state law enforcement are authorized to buy any of these technologies with DHS funds. You can see a whole host of these tools here.
The following pieces of equipment enable covert video surveillance; James Bond-like, they are made to look like everyday objects.
Have you seen any of these in real life?
The last one is particularly covert. It "monitors in total darkness."
Check out the RKB website for more.