Hello! i am getting a titer test done for a job interview. i do have medical marijuana in my system. will this show up in the titer test?

It depends on the test. Many companies do a broad based drug screening to detect any mind altering drug use in job applicants. These job related tests are exempt from drug testing rules of many states that require your written permission. Your application for the job waves your rights to consent. If they look for it they will find it. They may not consider you for employment based on that factor.