What Scanner are you using ?
I run NO Tones on my Federal Monitoring and use SEARCH
The reason being some of the channels are used by different agencies, but with a different PL/DPL and/or NAC, the only time I use tone is when I am getting routine interference and want to block it out from being Rcvd [usually images]
I would suggest spending some time [not every Federal Agency is active all the time, and some are Seasonal aka the USFS, BLM etc]
Search out the following bands, take notes [tones, site names, channel names, times, Radio check nets] from the following suggested search ranges.
138-144
144-150.8
162-174 [lock out the WX, but don't forget 162-162.3750]
380-400
400-420 [yes, most books list 406-420, but trust me go down to 400]
ALL in FM Mode, altho you might find some MilAir in the 138-150 range using AM still.
Best luck hunting. Take a month, and then post back what you found and what you have Identified for users..
And foremost, NEVER post live Surv Ops, always give it a cooling down period before posting that type of info.
Does anyone know if the federal frequencies in the Phoenix area use a tone (or a NAC)?
I'm using those in the RR Database -
Drug Enforcement Administration - The RadioReference Wiki