Uniden BC370CRS Owner's Manual page 7

This is done to comply with the legal requirement that scanners be
manufactured so they are not easy to modify to pick up these
transmissions. Do not open your scanner's case to make any
modifications that could allow it to pick up transmissions that are illegal to
monitor. Modifying or tampering with your scanner's internal components
or using it in a way other than as described in this manual could
invalidate your warranty and void your FCC authorization to operate it.
In some areas, mobile and/or portable use of this scanner is unlawful or
requires a permit. Check the laws in your area. It is also illegal in many
areas (and a bad idea everywhere) to interfere with the duties of public
safety officials by traveling to the scene of an incident without
authorization.
The FCC Wants You to Know
7