You want to count on thirty days for the THC to stay in your system,,
Not long enough!
My understanding is that the thc in your system can be detected by available tests to 28 days after ingestion. Of course there are substances available to defeat the tests. High Times magazine used to advertise a number of these products.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them