I'd suggest:

1. Get yourself some THC home test strips. They test at the same level (50 ng/ml) that you'll encounter on most drug screenings. Available on amazon for less than $1 each. You have enough time to KNOW BEFORE YOU GO! Take the guess-work out of it, and ease your mind. (Splurge for priority shipping, plenty of time).

2. Read the forum threads on. "Dilution" and "substitution". If there's any doubt, substitution, (i have Quickfix at the ready), is a good option. Read up on it here...it will pass any tests for authenticity, and of course, be THC free. Watch the youtube video on how to use quickfix (:10 second microwave heat....wrapping with the enclosed heating pad..temp control...etc.).

One way or another, you'll pass.