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I just don't believe there's any circumstance where I would be happy about winning with such a device on the car, legal or not.
But to answer OP's question, there are devices that can detect it without even touching the car. I did a report about the negative effects of traction control in motorsports in high school and at the time someone had developed a device that could be pointed at a car and would analyze what percent chance that the car was using traction control. So, while rare, there are devices out there that don't even need to look at the car to determine if traction control is present.
While some people do run it to a degree that can be heard from the stands, the people winning with it aren't. You would never know because the line between good throttle control and electronic assistance can be very fine.
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