can you help me answer the question below about this post minimum two paragraph answer and list all references

Imagine you are a deputy officer working for the King County Sheriff's Office. Last night you effectuated an arrest for possession of marijuana after you and your partner Deputy Sofia Hernndez Download Deputy Sofia Hernndez stopped a speeding vehicle and found marijuana. Upon stopping and approaching the car you detected what you believed to be marijuana smoke and immediately asked the driver and passenger to step out of the vehicle. Your partner Deputy Hernndez secured the couple while you began searching the vehicle. You found a small bag of marijuana hidden in a Pepsi can and placed the two under arrest for possession of marijuana.

The state of Washington legalized the use of marijuana in 2012. How does the use of legalized marijuana apply in this case?