He has already learned to keep trace evidence off of the bodies that would tell us much about him.
Just that you probably didn't find much trace evidence, if any.
"Where do you get that, unless they find trace evidence?"
In all likelihood, there would be more blood around here, and perhaps other valuable trace evidence.
"So you think he's trying to get rid of trace evidence?"
"What we're looking for is trace evidence," the official said.
After the murder, the police took it in, looking for trace evidence.
The hair and body bag had been searched for trace evidence.
Can you tell the jury what's involved in the collection of trace evidence?
Maybe there would be some trace evidence after all.