Large image view: Tracing marijuana to its roots
![[Photo: Read caption below]](/news/archives/news-archives-2002-2010/featured/07/marijuana/images/zoom/weigh.jpg)
ÃÛÌÒµ¼º½ photo by Marmian Grimes
Matthew Wooller uses a microbalance to weigh a sample capsule full of benzoic acid.
Large image view: Tracing marijuana to its roots
ÃÛÌÒµ¼º½ photo by Marmian Grimes
Matthew Wooller uses a microbalance to weigh a sample capsule full of benzoic acid.