Charlot123
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I doubt CODIS looks for matches with a close relatives. That is what the genealogy matching labs do.
The most likely scenario is, DNA found on Rachel was matched to a relative in Maryland who had submitted DNA to one of the genealogy databases. LE went and talked with that relative, who said that Victor was staying with them. LE obtained some of Victors clothing that was left behind at this relative house, which they used to obtain a positive match to the DNA found on Rachel. LE then knew Victor was the perpetrator.
I think they did build "parallel trees", hence the trip to El Salvador.