You asked on your other thread about a voice-activated recorder. It worked extremely well for me, but is NOT for the feint-of-heart. Trust me, after you hear your wife having sex with OM in her car, or phone sex over her cell from her car, you'll have a MUCH harder time with the "loving" half of "loving detachment" than you will with the "detachment" part.
Velcro'ing one up underneath her driver's seat, with fresh alkaline batteries DAILY, should do the trick in short order. You can get a USB-capable one, so that you can offload any fruitful recordings quickly before replacing the batteries and putting it back into her car.
Do NOT make the mistake of saying the ol' "Testing, one, two, three" into the recorder, as YOUR VOICE may then end up on there, should you get caught and she should find the recorder. And trust me, it's not a matter of "if" but of "when." Just do "tongue-clicks" instead to make sure it's picking up.
I would never recommend this, naturally, if this is ILLEGAL in your jurisdiction, but rather, if you had reason to be CONCERNED about your wife's safety, etc., it may be something that you could do to alleviate your concerns. Or so I've heard.
