Ever wondered about how samples of Alien Life would be stored if they were ever brought back to earth ? Here's an article on space.com that addresses such issues :
It's human nature to clean for company more thoroughly than one would for oneself, but nowhere is this truth taken to greater extremes than at the Johnson Space Center. NASA's setting new standards of cleanliness in its labs that handle samples returning from space. And their efforts are laying the groundwork for samples that might some day contain evidence of extraterrestrial life from Mars, Europa, and other points little known.