The first warning comes from the City of Frederick:
The City of Frederick would like our water customers to know that the free water testing kits currently being delivered door to door in some areas of the City are from private water treatment businesses which are not affiliated with or endorsed by the City of Frederick. These are private companies seeking to do business with City residents.
Frederick peeps, watch out for visitor [with] Wash Gas badge asking to see [your] Allegheny Electric bill. Fraud, call police.
Apparently the fraudster flashes a badge and asks to see your bill to see if he can save you money on it.
Be careful out there!