Here's an idea:

Find literature to show the relationship between your cannabinoid receptors and your opioid receptors, before and after brain-trauma.

After a head-injury, your opioid receptors are highly expressed, near the injured area of the brain, and, at the time of trauma, your hippocampus outputs twenty-six times the normal amount of endogenous cannabinoids (anandamide, 2-AG), in order to save your brain and shut down it's memory.