Just settling a debate with a friend...if someone peers in the window of your house (a nosy neighbor, for instance, or a peeping tom) and films you doing something illegal, could this recording be used against you to charge you for a crime?
Possibly. Depends on why the neighbor was filming, under what circumstances, and among other things whether the DA could get the tape authenticated and introduced as evidence....its certainly possible.
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Construction / Development Lawyer
Yes, possibly. You might have some defenses, depending on who was doing the filming and how it was done. It might also depend on what you were doing. For example, if a person is involved in or suspected of terrorism, the government can/will/does justify violating that person's constitutional rights.
If you are doing something illegal, make sure you keep your curtains closed.