A source close to Clarks family confirmed to The Post that he was the person who failed a polygraph test administered by authorities and that he also was the one with scratches on his chest two key points that law-enforcement sources have made about one person they are looking at.
"He did not pass the polygraph test. ... But of course, they dont always run true anway, especially when youre nerved up asking so many questions," the source said.
The source added that, "Of course, he had scratches on his arm from his cat."
The source said Clark, who the family calls "Ray Ray," had been working at the university building that morning along with his sister and her husband, who also are lab technicians. Clarks girlfriend is a lab techie as well.
"But [Le] left the area before he left that morning," the source said.
"Hed seen her and said hi and kept on going. ... He really didnt know her."
The family "is very upset," the family source added.
"I know he didnt do it, but I cant understand how anybody would do that in the first place and put her in the wall like that. And they would have had to do it at night because certainly nobody could have done it during the day when everybody was looking."