Keith's Caravan Charade

 is an unmarked quest in Fallout: New Vegas.

Quick walkthrough
Upon offering a helping hand, Captain Parker at Aerotech Office Park asks The Courier to find evidence that Keith is involved in drug dealing and crooked gambling. The note Investigate Keith's gambling and drug operations is added to the Courier's PipBoy. In Aerotech Suite 200, a pack of marked cards can be stolen from a desk (located in the southwest of the building). The dialogue options with Keith include a Barter check of 45 after which some Jet can be bought from him. Further, a Speech check of 60 lets The Courier inquire Keith's "system" at Caravan revealing that he is using marked cards.

Bugs

 * Captain Parker asks you to provide evidence that Keith is cheating at cards and selling drugs. Once you provide this information to Captain Parker he will enter Aerotech Suite 200 and confront Keith.  Captain Parker will begin a dialog with him.  If Keith was awoken by  Captain Parker he will go back to sleep as soon as the conversation is over.  Captain Parker, who wants kill Keith for insulting his wife, will spin around in circles above the sleeping Keith.  You can correct this by talking to Keith.  As soon as Keith gets up off his bed, Captain Parker will kill him.