Two things re: jammers:
1) having one is not illegal; using one is.
2) in California, possessing 1 to 3 laser jammer units is treated as a standard traffic infraction. Four or more separate jamming devices or heads escalates to a misdemeanor (aka more severe legal penalties and a criminal record)
The $50k and up to 5 years in prison apply to radar jammers under Federal Communications Commission (FCC) federal laws, not California laser jammers. This applies in every state, period. It is a very, very, very bad no-good idea to jam radar, anywhere.
IANAL, etc.