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Why would you ever take your hands off the wheel while driving!?
A safer way to tell if it's aligned in look for uneven wear on the front tires.
Let me re-phrase.
Let your hands float just off the steering wheel to see if it turns to either direction.
The car could still need alignment...who says the person didn't get new tires before he goes to see it? I never leave it to just tire wear alone. There's ways to cover up a problem.