Trying to figure out what to do

What’s yalls experience/advice about QF being flagged for synthetic? I bought some from a smoke shop but it didn’t verify, so I purchased from urine luck website and will verify tomorrow. Have been working on getting clean, but didn’t want to do it soon enough so not sure if i’ll pass normally. That being said, i’m really worried that they can detect that it’s synthetic. Can anyone give their opinion? I understand you have to get the temp right, but is that the ONLY thing?