"According to Ohio Revised Code, the per se limit for marijuana in Ohio is 50 nanograms per milliliter of blood. Young’s test came back at 112.90 nanograms per milliliter, the patrol said."
Links
[1] http://chronicle.northcoastnow.com/2015/08/31/troopers-driver-in-fatal-crash-had-marijuana-in-system/
[2] http://www.rethinkpot.org/tags/car%2A
[3] http://www.rethinkpot.org/tags/fatalities
[4] http://www.rethinkpot.org/tags/ohio