I still wouldn't let them in but just in case...make sure your home is spotless!!
they shouldn't have any reason then to take them.
also make sure there is visible water bowls everywhere for anyone at the door to see and clean floors with dry food in a couple bowls.more water bowls though.i think anyway.my opinion
if it's hard to do all this tonight try to get a friend to help you clean.i'm not saying it's not clean but anything will give them an excuse.anything.especially those type people who don't care about cats and that your doing your job in caring for them.