This scientist is testing a marijuana ingredient as a way to prevent relapse. It's a daunting task
A fully budded marijuana plant ready for trimming is seen at the Botanacare marijuana store ahead of their grand opening on New Year's day in Northglenn, Colorado December 31, 2013. REUTERS/Rick Wilking

NEW YORK - When she started collecting brains, neuroscientist Yasmin Hurd's peers wondered what she could possibly be thinking. Studying animals made way more sense as a way to trace how chronic drug use changes the brain, they thought - after all, how was Hurd going to parse the long-term effects from the trauma of the overdoses that killed the brain donors?