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.
Is it illegal to have a radar detector and a radar jammer, is a very old question. In general, using radar detector is allowed. On the other side, using a radar jammer is strictly forbidden. Most drivers use both devices, due to the fact they are more effective when used together.