In general taking pictures from a public footpath is legal in the USA even if you aim the camera at federal buildings, private property etc. Please put any cup of coffee etc down before viewing the following:
High Desert Community Watch - 1hr 45mins approx 1.5 million views
WARNING - language alert DO NOT TRY ANY OF THIS IN THE UK - the Americans have a written constitution which give them some protection to do these things. We DO NOT have the same protection in the UK. Anyway there is no need to be rude!
1. The following video carries a language warning. Do NOT shout these type of words in the UK as there are no freedom of speech protection in the UK (unlike the USA). Furthermore these type of words are rude.
2. The video is filmed in Denver, Colorado. The guy with the yellow top is Eric Brandt and he uses "colourful" language and signage re the police (especially re. their treatment of the homeless).