The science of the tests says you will pass. You have been clean for basically 55 days? Except for one small hit. The one time smoking events will not show up after 3-4 days. The 30 day average everyone speaks of is just that. An Average. Some people who smoke heavily and are slightly out of shape can actually take up to 60 days to be clean. This is the extreme case. The other extreme case is when you smoke once after being clean for a long time. In this case it will be cleaned out very fast. Sometimes the next day. I had to take a drug test for a very important job thing last semester. I researched this very much. I will tell you over another thing going for you. These tests are engineered so that they can avoid lawsuits. It makes sense. These testing companies would spend billions on lawsuits if these tests were implicating innocent people by getting a false positive. This is where an innocent non-drug using person tests positive for having drugs in their system. This is extra bad or these testing companies. So what they do is they skew the tests by requiring a cutoff on the percentage of this drug in your system. A solid quarter of society even clear and clean will have some traces of most drugs in their system because these types of molecules are present in very trace amounts in many many differnent over the counter drugs on the market. What this means for you is that there is a 70% chance or so that if you do test positive, you're gonna under this cutoff. Especially in your case it being such a small amount to be found. Rest easy, brother. You're golden.