Adam and Tessa met when Tessa had an interview/tour at the Crime Laboratory. Tessa started part-time in July of 2018 and Adam would invite Tessa to movies with him and other co-workers. Due to this, everyone at work thought they were dating long before they actually were.
After Tessa was full-time and almost completely out of training they started dating in October of 2019. Since Tessa could not keep a secret, co-workers were told soon after. Not many were surprised.