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.


 * If the player accepted The Coyotes quest, the option to turn in evidence of Keith's crime will not appear in Captain Parker's dialogue until The Coyotes quest is finished. Or the option will appear but Captain Parker will not confront Keith after it is selected and the option will not be available making the quest impossible to complete. (Not true on PS3 v1.01. Accepted Coyotes quest, then investigated keith. Parker talks to him, then kills Keith)


 * The barter check for Keith gives 45 experience each time it is passed, even in one conversation. As of PC Version 1.1.1 it can be used to infinitely level your character and/get the speech achievement.


 * Passing Keith's barter check while Captain Parker is on the way to arrest him for cheating breaks the quest. You'll be unable to turn in the quest and each time you talk to Captain Parker about Keith, you'll receive the note again.