Most jursidictions require that door-to-door solicitors obtain a license from the Municipal Clerk, Police Department, or local consumer protection agency and carry a government-issued identification card. Some of the laws actually regulate the hours when door-to-door solicitation can be conducted
Look for your local law. Just go to the New York State area and click on the link to your local government's code. (Hint: a good search term is "solicit.")
Legitimate salespeople will:
Identify themselves immediately and have a photo identification in sight
Not use high-pressure sales tactics
Respect a consumer's right to end the conversation or transaction at any time
Explain verbally and in writing the cancellation policy
Provide information about the offer/product in writing
Under New York State law, consumers have three business days to opt out of a door-to-door sales contract. Sellers must provide written notification of the right to cancel