Anyone know if this is a scam

[flowerchild]

How do we know if someone does show up at the door, or in summer meet us outside on our yard, that the they are actually from Ministry? Ask to see their badge? There really some crazy peeps out there...

I think I would ask to see some ID and then I would politely ask them to wait outside while I called the ministry to verify that they were who they said they were etc. A polite smile and a "you understand, of course, that a woman with small children in her care can't be too careful." In my opinion, they would have no reason to say no to that. Especially since they are doing checks "for the good of the children." I would make the call on the porch in their presence if they wanted, but it would be on MY phone and I would dial.