>>6251
Usually no, led is hardwired to activate when the camera is powered on. sure there can be exceptions to some models but that's unlikely.

>>6257
If someone has physical access to your computer and has decent knowledge in that area while you are clueless about them, you pretty much cannot escape being observed if only they want that.
same if you give your computer to someone for repairs they know everything about you since the computer will contain all web history passwords and other stuff.

The government cannot watch us not because it has no access but because it physically cant process that amount of information. At most it can monitor certain word use. it is same as if you were watching a big crowd of people.
Surveillance is only useful for gathering evidence if you already have suspect.