In this episode they called cracking the infrared lasers busted, but it is not.
I have tested my idea a couple times and every time it works.
I have used a macbook's camera and my home camera(Canon digital video camcorder zr600).
When i did this i could record my remotes infrared lasers, with out changing any features.
I also did this in a dark and bright room.
So if the mythbusters were to get the high speed camera to record the the laser impulses they could time them and send them back through another infrared laser and make that myth confirmed.

Infrared security lasers are constantly on. They do not transmit in regular or irregular pulses. The light travels at the speed of light in air, no more, no less. They don't go back to the source either. They are picked up by infrared sensitive sensors which control the alarms. Sensor fails to see infrared light, alarm goes off. Similar to those used in automatic garage doors when someone is crossing the path when the door is coming down. The alarm system which returns to the source is the sonar system which send an inaudible sound signal and measures the return echo. Any time difference within the set specs activates the alarms.

so it should work you have not told why using a camera won't work

can you reply i don't see why it won't work

Seeing the beams won't really help you. Security systems wouldn't use pulses, they use continuous lasers, so there is nothing to time.

I suppose it might help seeing where the lasers are and then simply not going to those places. Although the lasers are probably exactly where you'd want to go.

Also, not all infrared light is the same. A regular camera might be able to see IR light of a remote, but won't necessarily see a security system's laser, because the two devices are likely to work on different wavelengths.

Specifically, all digital cameras use silicon-based detectors, whose sensitivity cuts off at 1 micron (can't see anything with longer wavelength). Many IR lasers that would be well-suited for a security operation work at 1.1 or 1.5 microns.

Hell, they could really screw you by using something working at 8-10 microns, which is not detectable with anything a regular citizen can obtain.

ok i see what you are saying

On the topic of lasers, wouldn't the Mythbusters be wrong when they said that it is impossible to see a laser, like in the clip they showed with the blue lasers, because the person in the clip used a fog machine, which allows you to see the beams, not just by naked eye, and if they used a fog machine they would have been able to see the normal beams. If any of you have been to Lasertron, or any other laser tag place, generally you would notice that the beam shows up, thats why I have to take my alergy medicine before I go there because im allergic to the tree pollen base of their fog machine, even at a minimal level