most agencies have a policy on using marked vehicles for off duty use. Most officers drive them to and from work and also use them for extra jobs. I don't have a problem with the officers using them, within reason. I personally wouldn't tote my family around in a marked unit, there is to many instances of crazies shooting randomly at police cars for no reason. I wouldnt put my families safety in jeopardy for saving a few dollars in gas. JMHO