(Photo credit: pixelroiber)
Between 1969 and 1991, the USA had a law in place delineating the treatment of those found to have come into contact - or even proximity - with extraterrestrial beings, vehicles, or artifacts.
On 16 July 1969, a United States law was passed called the "Extra-Terrestrial Exposure Law" that made it illegal for the public to come in contact with extra-terrestrials or their vehicles. (Title 14, Section 1211 of the Code of Federal Regulations). Anyone found guilty of such contact could face up to one year imprisonment as well as a fine of $5000. Also, any individual who had been "exposed" could be quarantined under armed guard by the NASA administrator without a hearing.
And hey, in '69, $5,000 was a pretty big chunk of change. This was around the time of the Apollo missions, and while the feds publicly pooh-poohed the idea of extraterrestrials, they clearly weren't going to take any chances; an alien microbe, if allowed to gain a foothold here, could very well result in a global pandemic.
Look for a new version if a manned trip to Mars ever happens.