Yes, but only if you are driving while “impaired even to the slightest degree.”
Believe it or not, this is actually an improvement from the prior standard for medical marijuana patients because the Courts had interpreted the standard established in AMMA in such a way that it put the burden on a patient who is pulled over for a DUI to prove that they were not impaired (which often required hiring expensive experts), instead of the burden being on the State to prove impairment (which is the way it is supposed to be). The changes to the statute by Prop 207 reaffirmed that impaired even to the slightest degree is the standard for any adult over the age of 21 who has consumed marijuana (including medical marijuana patients) and is pulled over for a DUI.