Car and Driver had done some tests (last year, I think) that found that it
was actually more effective to "blind" the laser gun with high powered lights
(i.e. Hella Rallye 2000, etc) covered with in infrared filter. With the filter
on, the lights were not visible to the human eye, but could put out
sufficient light similar enought to the laser to greatly reduce its ability
to get an accurate speed reading. According to C&D's tests, you had a better
chance with this approach than with most laser detectors.