what is an interesting US federal law that I could write a research paper about?

http://www.freedomworks.org/content/19-ridiculous-federal-criminal-laws-and-regulations

I would think this would be fun:

Extra-Terrestrial Exposure Law
From Wikipedia, the free encyclopedia

The Extra-Terrestrial Exposure Law (14 C.F.R. 1211 of the Code of Federal Regulations) was the popular name for regulations adopted by the National Aeronautics and Space Administration (NASA) in 1969 to formalize its "policy, responsibility and authority to guard the Earth against any harmful contamination … resulting from personnel, spacecraft and other property returning to the Earth after landing on or coming within the atmospheric envelope of a celestial body."[1] Implemented before the Apollo 11 mission, it provided the legal authority for a quarantine period for the returning astronauts.[2] The regulation defined "extraterrestrially exposed" as

"...the state or condition of any person, property, animal or other form of life or matter whatever, who or which has (1) Touched directly or come within the atmospheric envelope of any other celestial body; or (2) Touched directly or been in close proximity (or been exposed indirectly to) any person, property, animal or other form of life or matter who or which has been extraterrestrially exposed by virtue of subparagraph (1) of this paragraph."[3][4]

Quarantining of astronauts on the first lunar missions was mandated in 1969 to prepare for "the remote possibility that they are harboring unknown lunar organisms that might endanger life on earth",[5] and the Apollo 11 voyagers were kept in quarantine for 21 days after their return from the moon.