He sure seemed legitimate when he knocked on the door.

But the Menomonee Falls woman who let him in has learned otherwise.

Residents on alert after the police issued a warning about a scam involving a man promising to asphalt your driveway.

Once he got inside a home, he stole a woman's purse.

She didn't realize it, until it was too late.

This is a M.O. detectives have seen and neighbors have heard about before.

\"Don't feel pressured,\" said Lisa Schiller of the  Better Business Bureau. \"Don't let them in. Ask for a business card. If they're professional they'll have a business card.\"

The suspect is a white man in his 30's.

He drives a beige or gray work van with a black trailer.

Police say the suspect might ask to break a $100 bill or try to get inside your home to steal valuables.

Anyone with information is asked to call 262-532-8700.