At most, you would be exposed to Introducing contraband in the third degree. That is defined under Washington law as
(1) A person is guilty of introducing contraband in the third degree if he or she knowingly and unlawfully provides contraband to any person confined in a detention facility.
(2) Introducing contraband in the third degree is a misdemeanor
Of course, there are two reasons you would avoid prosecution. The first is that you did not do it "knowingly". The second is that the prisoners were not at that time "confined" in a detention facility.
You may have lost your job, but I would not expect this to a rise to a criminal
matter. If it does go that far, you certainly have defenses as I have described.
If you have more questions please feel free to ask. I'll be happy to answer them. If you do not, please do remember to rate my service in assistance to you today.