Radar detectors and jammers?

I can only comment on detectors, I know nothing about jammers. I can't count the number of times they've saved my ***. That being said you have to know how to use it. It's not a free ticket to haul *** everywhere. Best used in traffic when they are checking the cars up ahead of you, lets you know to chill. When driving by yourself as soon as it goes off nail the brakes. Like something ran out in front of you. Evidently takes a millisecond for a radar to clock you. It's worked for me. On the other hand, if you do get stopped and you have one, expect to get a ticket. That's my experience from commuting 120 miles a day for 30 years.