Generally, a legitimate company will have their salesmen obtain a business license before going door to door. If you are contacted by a salesman and suspect that they are not legitimate, please contact your local Police Department
Some helpful information to get would be: Their name, a business card (if they have one), a description of the individual(s), a description of their vehicle (if they have one) and any company markings there may be. Also, any identifying or contact information they may give you during their sales pitch.
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