You heard Contra Costa County DA Col case investigator Paul Holes speak with us in the

series about the homework papers found in Dan Bill, as well as his role in finding the

DNA match that linked the East Area rapist and the original Night Stalker.

We spoke to Paul about his theories and he answered some key questions while we were researching.

Mostly Paul talked about where the offended man have lived.

The small paint chips, flakes and smear that were found at a few crime scenes were retested

in recent years.

We asked Paul his thoughts on this and about the possibility of the offender work as a

tradesman of some sort.

In one of the rooms they found these blue paint chips and that's where it was determined

through qualitative testing.

That is basically how well does this paint dissolve in different solvents, flaying tests,

very crude methodologies relative to the instrumental analysis that could be done today.

That you have to understand.

They determined that it was probably an architectural paint and it had a certain chemical component

within it that you would find an architectural paint.

Part of the problem with that evidence is where he's most intimately in contact with the

environment and with the victim during the sexual assault, they're not finding those blue

paint chips.

If he had those on his person they would be there in greater preponderance than someplace

else where he's just wandering around the house.

This is part of the theory of dealing with trace evidence.

...