Video cameras worn by every cop, every day. I want it.

[Xithras]

13. They have incredible leverage.

Just pass a law stating that local and state law enforcement agencies that do not have uniform cameras as not permitted to apply for federal grants, participate in federal training, request federal hardware (including those fancy rifles, vests, and MRAP's they all love), or make use of federal asset seizure rules.

The federal government can't pass a law mandating that local police departments wear cameras, but they can alter the finance model enough to ensure that the departments will chose to do so on their own.

It's like the seatbelt issue. The federal government couldn't mandate seatbelt laws, so it passed a law saying that states who don't mandate them aren't eligible for federal highway funds. The states passed the laws to avoid losing the money.