Report it to the police. If you are about to be a victim of identity theft, you need to report it right away. Then check your credit reports to make sure someone is not already using you identity. If so, talk to SSA about what you need to do to change your number......but that will be a long road and will require proof you have filed a police report, so start there.
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A person who uses someone else's social security number in Kansas is comitting a felony. You need to report it for fear that his income could be attributed to you and you could get in trouble for not paying taxes on the income. Contact your local police or sheriff. If you are worried about it coming back to cause you problems talk with a local attorney first.
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