::::::It would not be hard to state the facts as known.  There is some evidence that some forms of TS may be associated with ADHD, and there is some evidence that TS is not genetically linked to ADHD at all.  There is no clear consensus in either direction, and controversy remains.  Easy.  While there remains some concern about using stimulants in the treatment of tic disorders, there is abundant, replicated medical evidence supporting the use of stimulants in the presence of tic disorders, and showing that stimulants do not increase tics any more than placebo does.  However, the issue with Comings was quite different, as he extended the boundaries of Tourette's beyond the common co-occurring conditions of ADHD and OCD, to include such items as sexual deviation.