iPhone raw touchscreen data

Hello,
I know in my iPhone app I can get touch events. But these touch events are filtered for me. If I press the device against my face, it filters out these touch events because it can detect its not a finger. How would I get the raw touch events, not filtered in any way? Thanks.

From stackoverflow

• There is no public API for this. The closest you can get is GSEvent, from the GraphicsServices private framework.