This is one of those interesting cases. First 151.895 is not a public safety frequency, it is assigned to business radio. A waiver could be requested to use the frequency, but the business coordinator usually will not agree.
Second, a check of the FCC records do not show any license for this frequency issued to Osage County. There could be an error in the FCC data base, but if it is an error a correction should be made or the county can be fined and ordered to stop using the frequency.
Of course there is also the possibility that the county never had a license and just started using it. That is a serious violation and can result in big fines. The sheriff's office has no more right to use an unlicensed fequency than a business like Joe's Plumbing.
If the county does have a license for the frequency, the first step to correct the problem would be changing the PL and see if that corrects the problem. If they don't have a license they had better not ask the FCC for help.
This is also a case where the data base administrator should determine the validity of the entry for 151.895 by Osage County.