Found this in the latest issue of "Tools of the Trade" magazine...

Sending your crew out to work on a house? Better put a GPS unit in their
truck and then follow them to the site anyway to make sure they actually get
there. At least that's what the owner of Precision Roofing should have done
when he sent his crew out to re-roof a home in Granada Hills, CA. The Los
Angeles Daily News reports that, as it turned out, the house at 17722 Tulsa
St. did need a new roof--but only after the Precision crew was done
stripping it. The roof they were supposed to strip was at 17722 Tribune St.