Drug scheduling is the process of sorting controlled substances into categories, generally with the purpose of assigning higher levels of control over those drugs viewed as most hazardous. This implies a process of weighing the respective dangers and benefits of each drug, an undertaking of considerable complexity. As with many controversial topics, members of the public, and especially specialised academics, may feel that their opinions are not given enough credit. This is particularly true for popular drugs with vocal supporters, such as cannabis. Ted Leggett.