def check_within_aristotle_notification_permission(recipient):
    """
    The purpose of this function is to check if the 'within aristotle' checkbox
    has been selected in Notification Permissions of the recipient argument.
    :param recipient: User object who we are going to check the notification permission.
    :return: True if the checkbox is selected. NoneType otherwise.
    """
    if recipient.profile.notificationPermissions['notification methods'][
        'within aristotle']:
        return True
