I'd say it's more akin to gathering information or evidence without a warrant in order to guarantee that a warrant will find the evidence necessary to clinch a conviction from the case.

"Parallel construction" is a deceptive euphemism for using extralegal(illegal?)means to guarantee a perfect legal case. It's a complete undermining of the justice/legal system.

As far as the author's claims go, I think they're quite far fetched. It's not reasonable to say that because some people use dollars for illegal things, using dollars yourself for legal applications makes you vulnerable to prosecution for those illegal things.