Psychemedics Corporation is primarily known for its drug testing services, not enterprise infrastructure and IT solutions. Their website, www.psychemedics.com, focuses heavily on their hair follicle testing technology and its applications in workplace drug testing, employee assistance programs, and other related fields. There is no mention of enterprise infrastructure or IT solutions being a core part of their business operations. Therefore, a detailed writeup on Psychemedics Corporation focusing on enterprise infrastructure and IT solutions is not possible based on publicly available information.