Final answer:
Lynn has violated Illinois law by smoking medical marijuana in a moving vehicle as public consumption is illegal and it could impair her ability to drive safely.
Step-by-step explanation:
Yes, Lynn has violated Illinois traffic law by smoking medical marijuana in a moving vehicle. While medical marijuana is legal in Illinois and many other states for the treatment of certain health conditions, its consumption in public spaces, which includes inside vehicles, remains illegal. Specifically, the Smoke-Free Illinois Act prohibits smoking in vehicles when minors are present, and it would likely apply to medical marijuana as well. Furthermore, Illinois vehicle code would also not permit impaired driving, which could result from smoking marijuana while operating a vehicle, regardless of its medical status.