Space shuttle Discovery ended its 39th and final mission to space Wednesday, touching down at Kennedy Space Center in Cape Canaveral, Fla., just before noon local time.
The AP reports that NASA is investigating how 4.2 grams of cocaine got into NASA's Kennedy Space Center in Florida.
The AFP reports that the white powdery substance was found on March 7th and that law enforcement said the substance tested positive for cocaine:
NASA has a zero-tolerance drug policy. [NASA Spokeswoman Renee] Juhans declined to comment on exactly where at Kennedy Space Center the cocaine was found, or if any employees had showed positive results in drug tests.
Florida Today reports that an "unconfirmed number" of employees have been asked to take drug tests and that this isn't the first time cocaine has been found on the premises:
The investigation follows one initiated in January 2010 after a small plastic bag containing cocaine residue was found outside a restroom in the restricted hangar where shuttle Discovery was prepared for flight.
Roughly 200 space center employees were tested with no positive results for cocaine.
The investigation was closed without disciplinary action.