13.18. A person who is found guilty of an offence under section 14.1, 14.2 or 15 does not incur, in respect of the same facts, a penalty provided for in the second paragraph of section 13.2 or in any of sections 13.9 to 13.17 unless it was imposed on the person before proceedings were instituted against the person under section 14.1, 14.2 or 15.