Help, I"m not sure what to say in a job interview.

So...you're never supposed to say anything negative about former employers in interviews, it doesn't come across well.  But what do I do with the question of why I'm going to be taking a major paycut (most of the positions similar to mine pay much less) to work somewhere else?  The real reason is they've put me in a position where I have to break a variety of laws to do the job as they require of me, and I deeply don't like this.  At first I thought they didn't know and were going to get me the training and such I needed for compliance, but Have since realized nope, they don't want to put a cent into anything and are okay with ordering me to commit fraud on customers now too.  
 

For the life of me I can't think of a reason why I applied for a job with a $5/hr paycut to answer this question that doesn't sound like I'm a dumb flake or is the actaul truth, and I don't think telling teh truth in this case is good for me?  I don' t know.