Smoke one time - what's my window?

So here's the story, in so many words.
Got caught buying in school (dumbass i am, i know.), 10 day suspension. That was last near, may25th. I smoked one more time, june4th/5th. Smoked about half an eigth. My system is absolutly clean, i had a drug test in september, and i've still been clean since them.
I'm about 5'4, and i weigh if even, 110 pounds. My metabolism is rather high.

I've held out for 9 months, and i'm starting to lose it. I've lost my patience, and i want to know, if i were to smoke (IF EVEN) a gram, and then just drink a LOT of water in the days afterwards, how long would it stay in my system?

Also, which of the two would leave my system faster - eaten or smoked?
The only reason i wonder is becuase my probation was supposed to be done a month ago, so they could call any time for the final court hearing, plus i'm applying to jobs, and i just want to smoke once, then hold out till probation is done and my record is expunged. Thanks for the help in advance.

wow 9 months and you want to smoke why not chse an alternative like salvia... but anyways how often do you have these drug test and how many more do you have?

in a week youd be clean mabye even faster when one of my friends was on probation he was in a hot boxed car with us and it didnt even show up 9 months youd be good