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The form instance is not passed to this signal so I am afraid that you have to validate the data again:
def user_registered_callback(sender, user, request, **kwargs):
form = ExRegistrationForm(request.POST)
form.full_clean()
profile = ExUserProfile(user=user)
profile.is_human = form.cleaned_data['is_human']
profile.save()
Source:stackexchange.com