"Tests conducted at the Centre for Forensic Sciences showed flecks of auto body paint in colours...(orange, yellow, red, and pale green)...most likely used by youthful hotrodders. Light engine oil and grease were also found on the girls' clothing, (hands), and on the soles of their shoes...Also found were round blobs of metal consistent with welding". These discoveries led police to theorize the girls were killed at a garage, auto body shop, or general car repair shop, or at a motorcycle or car club. Or they thought the girls might have been transported in the back of a van or truck. Police at the time appealed for the public's help in locating such a site.
Investigators were stymied by the discovery of tiny crystals on the sole of Potter's foot. Tests determined they were composed of silicon, aluminum, iron, and titanium, but could not conclude their origin.