Years after we finished Eagle Bend for the City of Lawrence, KS, the FBI called my office and wondered if we had seen any bodies there. Apparently, they got a new lead on an old murder that said someone had put the body there. During construction, another lady wanted to move her dogs bones before we dug up the clubhouse area where she had buried it, but she never found them.
In the 1980's, while on site, someone found a deceased hobo in a bathroom on a site visit. I didn't look, and there was no real evidence of anything other than natural death.
We worked with a surveyor who had found several bodies while doing preliminary survey work for site development over the years. The police advised him that if he reported another one, he might become a suspect.
West of Ft. Worth, it took years to figure out, but a do it yourself owner had buried some construction equipment in a hole, and then claimed it as stolen on his insurance policy.
There are probably any number of environmental crimes (or at least violations, but there can be jail sentences) by contractors or owners willingly destroying habitat, wetlands, etc., directed to be preserved. Probably some toxic waste buried around in violation of clean up rules, too.
And, some designs are so bad, many of you would call those crimes as well!