How can I prove that my employer made me sign a statement under duress?

Question Details:

While working my employer took me into the back room where he had the head of Loss Prevention on the phone. They accused me of stealing, and after they saw I would not admit to such a claim, they threatened to go after my roommate for theft. Since they would go to jail if they were accused of basically anything, I told them what they wanted to hear. They also told me I could leave at any point but if I did they would send a cop to my house to arrest me. They made me fill out a statement, told me what to write and made me sign it. What can I do about this?

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