CHICAGO (CBS) — Investigators hope to learn in the next couple of weeks whether any more unknown victims of John Gacy have been identified.

Cook County Sheriff Tom Dart says the DNA samples of about 10 missing young men are being analyzed at a Texas lab that has been doing DNA ID checks on the Gacy case for free.

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Dart says a couple of the samples appear promising as the sheriff tries to identify the remaining seven unidentified Gacy victims.

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Last fall, one previously unidentified Gacy victim was ID’d as William George Bundy.

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“We’ve ruled probably close to 100 out, which leads to other unsettling questions what happened to this person,” Dart said. “Why is it that we have an inability to tie up those loose ends? That’s troubling.”

What gets him about the non-matches is that there have been so many missing young men whose whereabouts have been mysteries for years.

He says that, if unidentified indigents had been “handled properly,” relatives who come in with DNA samples of missing relatives might, at least, get some peace of mind in knowing what happened to them.

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Gacy murdered at least 33 young men between 1972 and 1978. Many of those victims were buried in the crawl space of his home.