Thallium is poisonous, putting in perfume would be a bad idea. Presumably this perfume was invented after the success of the perfume named simply "Poison". I guess they figured they would be a bit more subtle. Presumably, also, it does not contain any thallium.
Source: eBay seller fragrancealley
Contributor: Theodore Gray
Acquired: 2 April, 2009
Text Updated: 3 April, 2009