I was reading Destructoid's interview with the developers of Payday: The Heist where they go through the arsenal of weapons. One of the devs had this to say regarding the trip mine weapon:
Insider hint: Put a trip mine on the ground, switch off the laser beam (yeah you can switch it on and off as you please) and then when some enemy who can take a LOT of damage (cough Bulldozer cough) stands near it, shoot at the trip mine (preferably with a weapon that has some spread, so that you know you'll hit it) and BAM! That sucker is GONE!
This seemed to imply to me that if you turn off the laser beam, the AI may be less likely to notice and/or react to the trip mine. Is this actually the case? Or does turning off the laser sight just make it so the trip mine must be manually detonated, allowing you to be more precise about its explosion?
I don't have trip mines yet, so I cannot test this myself.