It is a fundamental that it is almost impossible to prove a negative. The burden on the state, although only the nine states subject to the DOJ oversight of the Voting Rights Act, is to prove that the voter ID requirements are NOT established to discriminate against a class of people.
Listen to this discussion and honestly ask if the arguments make sense:
But, maybe the real question when you listen to the whining about poor people simply not having the time to get a photo ID during the months between elections is:
How did you register to vote in the first place?