C. Crane BC75XLT - Manual (Page 9)

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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 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.