some of these methods as well. >> sreenivasan: all right, oregon public broadcasting's reporter, jeff mapes, thanks so much. >> you're welcome. >> this is "pbs newshour weekend," saturday. re >>ivasan: and now to "viewers like you," your chance to comment on stories you've seen here on pbs newshour weekend.nd last weewe reported on a variety of new ways to determine whether someone is too high to drive, a marijuana.s legalize we began with a look at researc bene at massachusetts general hospital. >> reporter: jodi gilman is an assistant professor at harvard medical school, and a researcher with the hospital's center for addiction medicine.a >> the i that your brain looks different when you're intoxicated. what we're lookingor is a neural signature of being high. so we're looking at the brain when you're not high, and the brain when you're high, and trying to detect differences between those two brain states. police could test for alcohol in buthe system. with t.h.c., the psychoactive ingredient marijuana, it can be in my system for weeks, and figuring out whether i'm impaired bcause of it i