If you are going in to ask for a anti-harrassment order, evidence of his temperament and disposition is appropriate if you make it clear you are doing it for this purpose. A pattern or course of criminal convictions reflecting this is clear evidence that his behavior is not accidental or mistaken, but rather part of a deliberate and and larger problem of his temper and behavior. That being said, a drug conviction is not the sort of charge that reflects this sort of temperament and disposition, and raising it would make it appear that your trying to influence the court's ruling though mud slinging and the court will not look fondly on this sort of behavior. Good luck with this one: I recommend, if possible, using a video tape recorder to catch him in violation of the order, or to show that despite the previous attempts at an order, he is deliberately hanging around your house (given you have previously sought orders, he is on notice that you do not want him around). Police cannot and will not ignore this sort of hard evidence.
Why were you twice previously denied an antiharassment Order? What was the Court's reasoning? Sounds like you were at least able to secure a Temporary Order..was that the first time or both times? Did the other party have representation? Typically, anti-harassment hearings do not include the ability for supporting witnesses to present live testimony...usually their "testimony" is restricted to sworn declarations filed with the Court and served on the other side. Check your local court rules. Better yet, I recommend you confer with an experienced family law or protection order attorney in your county to determine how to proceed at this point.
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It is relatively easy to obtain a protective order. The rules of evidence apply. Read them here:
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