People keep saying this, but I cannot find proof. The best I can find is a regulatory advisory:
http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisor...
http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&sid...
Here is where they are talking about drones:
http://www.faa.gov/news/fact_sheets/news_story.cfm?newsId=62...
This is recreational use, and I consistently see people deferring to this "Advisory" circular which specifically states it merely "encourages voluntary compliance"