The stuff is pungent and could have been on your clothes, a backpack, a bag, most anything - maybe even leaching from the pill bottle. Those of us that do not smoke it can usually smell it with ease.
If you have been cited for the section listed below, jail is a possibility (though probably not too likely):
The only thing that I am concerned about is could I go to jail if I plead guilty I court? The cops said it was just like a speeding ticket and it wasn't a mistaminer or whatever he said forfeiture or something along those lines.
(e) Tetrahydrocannabinols. If a person possesses or attempts to possess tetrahydrocannabinols included under s. 961.14 (4) (t), or a controlled substance analog of tetrahydrocannabinols, the person may be fined not more than $1,000 or imprisoned for not more than 6 months or both upon a first conviction and is guilty of a Class I felony for a 2nd or subsequent offense. For purposes of this paragraph, an offense is considered a 2nd or subsequent offense if, prior to the offender's conviction of the offense, the offender has at any time been convicted of any felony or misdemeanor under this chapter or under any statute of the United States or of any state relating to controlled substances, controlled substance analogs, narcotic drugs, marijuana, or depressant, stimulant, or hallucinogenic drugs.