FBI Investigates - Laboratory Results

While combing the grounds for additional clues, a tiny piece of metal was discovered inside the door. The metal was immediately taken back to the laboratory, where it was sent to the Firearms and Toolmarks Unit (FTU). The unit compared the piece of metal found inside the door of the building with a screwdriver that was later found at the suspect's residence. How did they do that?

The DNA Unit analyzed blood found on the screwdriver. It matched the DNA taken from the suspect. How did they do that?

Photograph of a black BMW motorcycle.Witnesses interviewed the night the bomb was found told the Agent that they saw a man riding his motorcycle away from the building. Paint chips were recovered next to the door where the suspect leaned his motorcycle. The Chemistry Unit's Paints and Polymers sub unit (PPSU) compared these paint chips with those taken from a part of the motorcycle that was submitted as evidence to the lab. How did they do that?

Photograph of a thumb print.Fingerprints and palm prints were found on the recovered motorcycle and on the screwdriver. The Latent Fingerprint Unit compared the prints and determined that they matched the suspect's fingerprints. How did they do that?

Photograph of an examiner looking at hair sample on slide.
Hair was also found on the backpack. Trace Evidence Unit analysis determined that it was a human head hair. After obtaining a known head hair sample from the suspect, it was determined that the hair found on the bag was consistent with having come from the suspect. How did they do that?

Photograph of a army green backpack.In the backpack, investigators also found a map and handwritten directions to the building. The directions were written on a piece of paper that appeared to have been torn from a notebook. The Questioned Documents Unit compared the handwriting used on the note with a sample of the suspect's handwriting and found that they closely resembled one another. How did they do that?

FBI Agents presented this evidence to prosecutors for court proceedings.