It can be. "Moral turpitude" is somewhat of a catch all.
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(in the US) Importuning is NOT a crime of moral turpitude.
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They accused the positions of moral turpitude.
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No, that charge is not a crime involving moral turpitude.
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I don't think there is a 'most common form' of moral turpitude.
But wiki has a list of common types of moral turpitude...
http://en.wikipedia.org/wiki/Moral_turpitude