A very good first draft. The best route to improvement on the execution side is to add links to good-quality sources supporting the extensive factual propositions included here. If you found them in the course of preparation for writing the draft, they should be easy to add.

Substantively, I think the best route to improvement is to concentrate less on the Fourth Amendment, which simply does not provide relevant protection for the privacy of genetic information held by third parties, given ts limitation to criminal prosecution situations and the absence of need for the direct introduction of genetic evidence once the persons of interest identified by genetic searching have been investigated and other evidence gathered by other means. More attention to the legislative possibilities would therefore be helpful.