shapeshifting

If I had a superpower I would use the shapeshifting power. With the use of special eyes I would take on the form of the person or the target I am after. The form I take on will stay the same and the person is unaware that I took on the form of him or her. I would use the powers for good to help the law and stop bad people they can't handle on their own. I would rather keep the shapeshifting power a secret from everyone, but in case of emergencies I have a friend to help me out. My friend could tell me from the fake because of the birthmark on my back in the shape of a sqaure. This would really help people out especially if someone can't be in two places at once and if they can't handle tough people.