There are lots of neurotransmitters, and synapses that use dopamine and serotonin are actually pretty rare in the brain. This is compounded by the fact that there is a wide variety of receptor proteins for each neurotransmitter. The same neurotransmitter binding to different receptors can result in different things.
Radar detector laws in USA. State radar detector laws in New York, New Jersey, and Illinois specify that you cannot have a radar detector in commercial vehicles over 10,000 lbs, which is also a federal law. In those states you also cannot have a radar detector if your vehicle weighs over 18,000 lbs.
Windshield Mounting Laws. The other issue with radar detectors that often confuses people over their legality is where they can be mounted. While it is entirely legal to own and use a radar detector in California and Minnesota, mounting one on a vehicle's windshield will result in a ticket.