Corrected entry: It is highly unlikely that government branches of the CDC and Military would be so lax on the security, protocols and enforcement of containment for what is perceived to be an alien life form to allow as many of the mishaps to occur throughout the film.
jerimiah
25th Aug 2009
Correction: This is a comedy film and as such, the government agents and agencies are depicted as being incompetent in several areas for comedic effect. If it's a plot hole here then it's a plot hole in every comedy film that shows a bumbling police officer.
BaconIsMyBFF