Federal Frequencies
DEA Frequencies
  
120.375             Aircraft
120.775             Aircraft
281.400             Aircraft
418.500             Air-to-ground

171.625             National Assignments 
172.000             National Assignments 
172.100             National Assignments 
172.200             National Assignments 
172.300             National Assignments 
414.125             JTF
173.000             DEA to FBI
418.200             DEA to IRS (Car-to-car)
418.225             DEA to IRS (Car-to-car)
418.575             DEA to US Coast Guard
418.650             DEA to IRS (Car-to-car)

419.225  413.975    Local systems
419.200  414.600    Local systems
418.775  416.375    Local systems
419.275  414.425    Local systems / JTF
419.000  417.400    Local systems / JTF
418.800             Ch. 1 (Tactical/Car-to-car)
417.750  413.975    Ch. 9 (Local systems)(Car-to-car)
418.050             Ch. 10 (Interagency coordination)
418.075             Ch. 11 (Interagency common)

418.625  416.050    Strike Force Ch. 1
418.900  416.325    Strike Force Ch. 2 (Operations/surveillance)
415.600  418.750    Strike Force Ch. 3 (Tactical/Car-to-car)
418.675             Strike Force Ch. 4 (Tactical/Car-to-car)
418.825  415.600    Strike Force Ch. 5 (Operations)/Ch. 3
418.950  416.200    Strike Force Ch. 6 (Operations)
418.975  417.025    Strike Force Ch. 7 (Operations/Car-to-car)
418.175             Strike Force Ch. 8 (Tactical/Surveillance)(IRS)
419.250  411.125    Strike Force Ch. 9 / Local systems
419.300  414.525    Local systems / Strike Force Ch. 11 (Tactical)
419.375             Strike Force Ch. 12 (Tactical)

163.185             DEA
163.535             DEA
164.825             DEA
165.235             DEA
165.260             DEA
165.285             DEA
165.375             DEA/ATF (Secret Service "Charlie" - interagency)
172.050             DEA
416.600             DEA
417.040             DEA
417.450             DEA
417.500             DEA
417.550             DEA
418.550             DEA
418.700             Tactical 
418.725             DEA
418.875             DEA
418.925             DEA
419.950             DEA
 
DEA High-Density Drug Trafficking Area Frequencies
414.550  412.525    Rptr. / Ch. 1
414.500  419.425    Rptr. / Ch. 2
414.025             Ch. 3 (Car-to-car)
414.050             Ch. 4 (Car-to-car)
414.150             Ch. 5 (Car-to-car)
412.000  417.125    Rptr. / Ch. 6
414.350  419.325    Rptr. / Ch. 7
414.450  419.375    Rptr. / Ch. 8
414.475  419.400    Rptr. / Ch. 9
412.125  417.175    Rptr. / Ch. 10 (JTF)

ATF Frequencies
NOTE: I have heard from sources that these were the frequencies that were used in Ruby Ridge, Waco, and the Freemen standoff. They maybe scrambled
165.2875
165.3500
165.5125
165.9250
166.2875
166.8500
166.9250
168.0000
170.4125
173.8875
United States Postal Inspection Service
These frequencies are use bysecurity force that provides protection at post offices as well as criminal activity realting to the post office.
413.6000
413.7000
414.7500
414.9750
415.0500
415.1500
415.9500
416.0750
416.2250
418.3000
FBI Frequencies
162.6375
162.7875
163.7250
163.7750
163.8000
163.9125
163.9375
164.5500
167.3125
167.4500
167.6125
You should also search thru...164.0000 - 164.5500 and 167.2375 - 167.8000..