Some of the initial chemical analysis would be done in a mobile field laboratory during the investigation.

BBC: How to investigate chemical weapons allegations

The study, published last year in the Journal of Clinical Investigation, involved laboratory work with sinus tissue samples from 56 people.

WSJ: People Who Taste Too Much

Pound also criticized U.S. athletics bosses over a spate of recent drugs cases among American athletes following an investigation into the BALCO laboratory in California, where THG was developed.

CNN: Anti-drugs chief confirms HGH test

Scraps of at least one pressure cooker, nails and nylon bags found at the scene are being sent to the FBI's national laboratory in Virginia, where technicians will try to reconstruct the devices, the federal agent leading the investigation said Tuesday.

CNN: Boston Marathon attack: More details, more questions

Bonds' testimony in December 2003 was part of the investigation that targeted his personal trainer, Greg Anderson, and employees of the California drug testing laboratory known as the Bay Area Laboratory Co-operative, or BALCO.

CNN: STORY HIGHLIGHTS