An informational piece from the ACLU (American Civil Liberties Union) about your rights as a photographer.
http://www.aclu.org/free-speech/know-your-rights-photographers
Here’s one from Bert P. Krages II, an attorney, that you can download and carry with you.
http://www.krages.com/phoright.htm
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Study and practice photography with Sam –> https://samdamico.com/study-practice-photography-sam/