I think all police and sheriff can legally do them. Now whether or not any random officer you ask will, I dunno. You'll probably have to call and go to an office. State Patrol can do them, too. In the Front Range all Air Care Colorado emissions stations can do them as well as some independent inspection stations.
In Mesa County (Grand Junction, Fruita): http://clerk.mesacounty.us/mv/vin-in...n-process.aspx
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"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein