Right. Both are good questions.
If I may, I will answer the second question first. The development of drug resistance is an extremely complex phenomenon. Some people--who are not qualified to make comments on it, in my opinion--have decided to put forth a wildly speculative conclusion based on a graph, which, as I think I've explained to you, had many other factors that needed to be considered before any conclusion was made on that point.
That case in itself is a matter of someone who either didn't understand the science or simply preferred to move forth with a perspective to suit their agenda.
As to drug resistance and what it looks like, if you'd like I can refer to antibiotic resistance in bacteria. Or is your question, Mr. Donnelly, specifically about lice?