Do I Have Any Legal Basis?

Hey guys, I have an interesting situation and I’m wondering if I have any legal basis. So I have been job searching and found a job I applied for, interviewed for and was given a conditional job offer based on background check and a drug test. I signed my offer letter and submitted my background check. Before taking my drug test, I emailed someone from HR asking specifically before I go take my drug test, do you test for marijuana. I am in a recreationally legal state so a lot of employers do not test for it here. I received a response back saying that while they do test for marijuana, if the test comes back positive they will disregard a positive result. Plenty of other employers also follow this practice. I went and took my drug test and have been waiting for a start date. Well today I get a text from the hiring manager saying HR has decided not to move forward with hiring with me after reviewing results from background check/drug test. I have a squeaky clean background. Nothing there whatsoever, so now I have a feeling it has to do with my drug test. I sent all my screenshots of my correspondence with HR to the hiring manager and said I did my due diligence about asking all the questions I needed to ask, so I need them to tell me why otherwise I feel like this could be discriminatory in nature and I will consult with the EEOC about this. I already quit my other job because this seemed so set in stone and now it seems like it’s not going to happen. I am located in Colorado, if anyone has any advice that would be great. Thank you.
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