I wonder if they will ever equip cop guns with tiny cameras and memory chips.
The police will never support this. It only adds a problem to a situation where a problem previously did not exist. Furthermore, every time someone tries to bring up such legislation, it raises a big protest from law enforcement agencies, and each time, the people who propose such laws attempt to put in exemptions for law enforcement in order to keep them quiet, which defeats much of the original purpose of the legislation.
Thus, the legislation then becomes a piece of hypocritical garbage.
In a firearm, you have a piece of machinery that needs to be able to contain an explosion of tens of thousands of pounds per square inch. For some duty rounds, such as the 357 SIG, we're looking at up to 40,000 psi.
These kind of pressures mean that the weapon is going to be undergoing a lot of shaking, vibration, etc., and that would easily disrupt any such fragile items inside, as lklawson explained. The only way you're going to be able to make something withstand that kind of impact / jarring / etc., is to make the device so sturdy, that you're now looking at black box-types of devices, which are very heavy, and bulky.
Kinda like dashboard cams, for the purpose of documenting shoots.
Dashboard cameras are mounted on a relatively stable platform. They're not going to be jarred around like they would on a firearm. Imagine this, that if you took a dashboard cam, and battered it repeatedly with a significant impact, what would happen to the camera?