It is repeatedly stated that versed (Midazolam} is not available by prescription. Even when given in a hospital environment, there is an order for the medication which is effectively a prescription. This is necessary for both control and billing purposes. Also, versed is available as a nasal spray prescribed for epilepsy.
When Lt. Provenza explains what a FLARPL is, Lt. Flynn asks him if it was his second wife that did that to him, and he indicates that his fourth wife did. Lt. Provenza mentioned in the first season that his second and fourth wife are the same woman.