Meet Kim, a quality control microbiologist at the biopharmaceutical corporation Bristol-Myers Squibb. Her company makes a range of medicines to treat many diseases, and it's Kim's responsibility to make sure the products she works with are safe and effective before they reach patients. For example, she tests the purity of as many as 100 water samples each day because water is one of the main ingredients in drugs. Kim explains the importance of quality control in drug manufacturing, and how new biotechnology tools help her do her job.