If solicited by an individual for personal charity, don't give cash; offer to buy the individual food or drink or refer them to local assistance resources.
If solicited for an unfamiliar organized charity, ask for literature so you can make an informed decision about giving; any reputable organization will be glad to provide material.
If solicited by telephone, do not give out credit card numbers or personal information not listed in the telephone directory, and don't allow the organization to come to your home until you are certain of their reliability. Instead, ask them to send you information so you can make an informed decision and mail in your donation.
With the exception of local organizations, door-to-door sales are often fraudulent, and should be viewed with skepticism. If it sounds too good to be true, it usually is.
Under consumer protection laws, you have a right to written information about any offer, and the right to cancel any order within three days should you reconsider your decision.
Make sure you obtain enough information to enable you to re-contact the vendor or his/her office in the event you have questions or change your mind. If you don't want to be bothered by door-to-door solicitors, most locations have a law that solicitors must avoid homes which display a "NO SOLICITORS" sign; bear in mind this usually doesn't apply to religious proselytizing or charitable organizations.
Promptly report suspicious persons, vehicles, and crimes to the local law enforcement agency.