I have been hearing what sounds like P25 on 451.900 lately. I know a lot of energy companies go to P25 since they have the money to, but I don't have a P25 scanner any longer to check. Maybe you guys with digital radios could give a listen and see if this is indeed Chesapeake Energy (WQIL885). They do have a roving security unit and it could also be used for their operational vehicles, etc. Thanks.