Good for you heather. Look for a support group, it is often very helpful if we can share our experience strength and hope with each other.
It is my understanding that reefer is for the most part out of your system in a month or so. If they test your hair, that’s another question. It stays in the hair until it’s cut off.
As with all other things, honesty is probably the best policy. Tell the truth and let the chips fall where they may.
At any rate, best of luck in your new life
richard