Radio Amateurs
The following copy of the Florida Statutes concerning having a scanner 
or Xcvr in your vehicle(s) capable of tuning police and fire rescue frequencies.

This was prompted by a few incidents during the past hurricane season.
 Many individuals volunteered many hours and they used their own equipment. 
During this time a few law enforcement officers became curious as to how 
a non-law enforcement individual could monitor police and other radios. 
Needless to say, it became necessary to offer a few long-winded explanations 
without any supporting substance.

Please refer to Section 3 which sites the exemption.

You are encouraged to place a folded copy of the law in a sealable sandwich bag. 
This is kept in the glove compartment of each vehicle at my home. Ideally 
it would be great to have a copy in your wallet but I found this to be too
 cumbersome - don't forget a copy of your amateur radio license.

State of Florida Mobile Scanner Law
Source:
FLORIDA STATUTES (1995) -
Title 46, CRIMES; Ch. 843, OBSTRUCTING JUSTICE; § 843.16
843.16 Unlawful to install radio equipment using assigned frequency of
state or law enforcement officers; definitions; exceptions; penalties

(1) No person, firm, or corporation shall install in any motor vehicle or  
business establishment, except an emergency vehicle or crime watch  vehicle
 as herein defined or a place established by munincipal,
county, state, or federal authority for governmental purposes, any 
frequency modulation radio receiving equipment so adjusted or tuned
 as to receive messages or signals on frequencies assigned by the 
Federal Communications Commission to police or law enforcement officers 
of any city or county of the state or to the state or any of its agencies. 
Provided, nothing herein shall be construed to affect any radio station 
licensed by the Federal communications Commission or to affect any recognized 
newspaper or news publication engaged in covering the news on a full-time basis 
or any alarm system contractor certified pursuant to Part II of Chapter 489, 
Operating a Central Monitoring System.

(2) As used in this section, the term:

(a) "Emergency vehicle" shall specifically mean:

1. Any motor vehicle used by any law enforcement officer or employee of any city, 
any county, the state, the Federal Bureau of Investigation, or the Armed Forces 
of the United States while on official business;

2. Any fire department vehicle of any city or county of the state or any state 
fire department vehicle;

3. Any motor vehicle designated as an emergency vehicle by the Department 
of Highway Safety and Motor Vehicles when said vehicle is to be assigned 
the use of frequencies assigned to the state;

4. Any motor vehicle designated as an emergency vehicle by the sheriff of a
ny county in the state when said vehicle is to be assigned the use of 
frequencies assigned to the said county

5. Any motor vehicle designated as an emergency vehicle by the chief of 
police of any city in the state when said vehicle is to be assigned the 
use of frequencies assigned to the said city.

(b) "Crime watch vehicle" means any motor vehicle used by any person participating 
in a citizen crime watch or neighborhood watch program when such program and 
use are approved in writing by the appropriate sheriff or chief of police where 
the vehicle will be used and the vehicle is assigned the use of frequencies 
assigned to the county or city. Such approval shall be renewed annually.

(3) This section shall not apply to any holder of a valid amateur radio operator
 or station license issued by the Federal Communications Commission or to any 
recognized newspaper or news publication engaged in covering the news on a 
full-time basis or any alarm system contractor certified pursuant to Part II 
of Chapter 489, Operating a Central Monitoring System.

(4) Any person, firm, or corporation violating any of the provisions of this 
section shall be deemed guilty of a misdemeanor of the second degree, punishable
 as provided in s. 775.082 or s. 775.083.