Maresche -- regarding testing for drug allergies -- I can speak from a human perspective. It is difficult to predict reactions. I am allergic to pencillin yet I took it as a child. In my mid-20's I suddenly developed a severe reaction and have to be very careful. There are other drugs to which I have an unusually intense react -- painkillers and the like. Consequently I avoid medication if at all possible. I've rambled but the point is reaction to chemicals is VERY hard to predict and can change with diet, age, etc.