as hwybear says, - radar would not make a mistake (careful how you interpret this)... ..... I think what he saying (without saying it), is that radar would not make a mistake, but the officer could!!!!
Trying to trip up an officer on the stand using radar technology can be tricky. Unless you really know what you're talking about, you may have a tough time with that. Use discoure to at least find out the exact make and model of the radar gun, and find the manual online. Then really read it. I mean STUDY it. I don't think a JP knows much about it so if you scare him with technology questions, he may favor the officer. You really need to get the officer to admit he made an error using the equipment and I highly doubt he would make a mistake (they use it every day). Then again, maybe they are complacent with such, and make all kinds of mistakes TICKETCOMBAD coyuld porobably help more on this issue than me. A better defense, is to cast doubt. Using a radar mistake is one thing, but you would need to find at least one or two additional things to show the JP that there is significant doubt. One little thing will not be enough.