Toxic samples

Toxic samples is a paper note in the Fallout: New Vegas add on Dead Money.

Location
It can be found inside of Ennis's locker in the Puesta del Sol switching station.

Background
The toxins the group collected was a residue created by the Villa's power generators which were, much like the rest of the Villa, hastily constructed. These toxins created both the Cloud and, somewhat indirectly, the ghost people.