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I like Ann Rule a lot. In one of her books she mentions something that stuck my husband and myself as odd. It is in 'Too Late to Say Goodbye' .
She claims, on page 41 of the paperback, that merely touching toilet paper or paper towels can cause a false positive on the gunshot residue test.
How can this be true? I can find nothing but her book's reference when I google it. My husband has emailed her with no answer as yet forthcoming.
The book reference was in the context of the suspected perp., the husband, having been staying away from the police and crime scene for some time, and the police had to get a court order to be able to swab his hands for the test.
For those of you who are interested, I asked this question on the Hobby/Gun forum and got a small debate going, most of which was a bit technical, but someone answered that he thinks it's true because Robert Blake's attorney said any "residue" could have come from his wiping his hands on a paper towel from the restroom.