"Since quality controls are necessary for all experiments, it's imperative that both the negative and positive control are successful. Depending on which one fails, I will troubleshoot accordingly. For example, if the positive control fails, I would first check whether or not I added the sample, as human error is a common reason for failure. If there is an internal control for all samples, including controls, I would ensure it is detectable. Other positives on the run eliminate reagent and machine errors of any sort."
