Petraco seems to specialize in tool marks and other items of interest:
http://web.jjay.cuny.edu/npetraco/mywebpage.html
Research Interests:
Applications of Statistical Pattern Recognition Techniques to Physical Evidence in Forensic Science
o Analysis of shoe sole "accidental mark" patterns
o Toolmark striation and impression patterns
o Patterns in spectra of mixed and highly contaminated samples
http://www.biomedexperts.com/Profile.bme/1109827/Nicholas_D_K_Petraco
Petraco Nicholas; Petraco Nicholas D K; Faber Lisa; Pizzola Peter A
Preparation of tool mark standards with jewelry modeling waxes.
Petraco Nicholas D K; Gil Mark; Pizzola Peter A; Kubic T A
Statistical discrimination of liquid gasoline samples from casework.
Petraco Nicholas; Kubic Thomas A; Petraco Nicholas D K
Case studies in forensic soil examinations.
That's interesting, WOFL lists him as a criminalist and hair banding expert. I wonder if the defense is trying to divert the media or if there is an error in the reporting?
I"ll go read your links now. Thank you.