In scanning local/state police I run across at heading called "CLEMAR"

What does this mean?

I think it has something to do with mutual aid.


Burr
Grundig's Sat800&650,YB400&FR200
Drake SW8 Scanners BC 895&245XLT
Sangean DT110(for Ball Games)
Also Have a Clock Radio!!!
N35.3582
W117.4157
South Left Coast, U.S.A.