The control questions are established during the pre-test phase. You should not be making any admissions during that time. In your example, I would not admit to having stolen anything. During the actual test, you show a reaction to that question. When you are asked about it, you can make a minor admission such as "I suddenly remembered the time when I was a kid when I took some money from my parent's wallet." 

It sounds like you are worried that the controls will be changed to relevants during the in-test phase. That won't happen. The examiner will go over the questions with you beforehand and they will not change once the test has begun.

I'm a little confused on control questions.  I am supposed to use countermeasures on the control questions so that my bodies reaction is higher than my response on relavant questions.  But eventually the control questions become relavant questions, don't they?  For example, "Have you ever stolen anything?" This is a control question which I will produce a reaction to, but when I make a small admission the question will become, "Have you ever stolen anything worth more than $200?"  This is now a relavant question.  So when we go through the questions over and over, they will eventually all be relavant questions and no control questions.  So now I no longer can use countermeasures to my advantage, but must simply remain calm during all relavant questions.  Do I have this right?  How do I get around this?

Thanks,
-V