Hoping someone who understands the thc/ng stuff better can chime in. Just checking the article linked about Washington's laws seems like 12 ng could actually be pretty low. I actually found another source that said you could get up to 30ng just inhaling second hand pot smoke and that levels of 50-100ng are not uncommon among users.
Anyone here profess to being a pot expert? Lol!
12 NG is 2 1/2 times the legal limit here in Colorado.
Like a BAC of 0.2