I don't know what is up here but something isn't right. If everything you are saying is correct the first thing is why did they go back more than 90 days or 1 & 1/2 inches of hair. Guidelines in hair testing set up by the FDA and SAMSHA have set the accepted length of hair tested to be 1 & 1/2 inches because it becomes inaccurate after this length. Why did they give you a "timeline" of use because that is odd too.

Something stinks in Denmark here.

Yes if you think hair testing is expensive it is about $60-$90 a test now.

There are ways to beat the hair test, they aren't 100% but you can improve your chances of passing.