§ 1. To the extent to which one can impose precepts by virtue of the power of governance in the external forum in accordance with the provisions of cann. 48-58, to that extent can one also by precept threaten determined penalties, with the exception of perpetual expiatory penalties. § 2. If, after the matter has been very carefully considered, a penal precept is to be imposed, what is established in cann. 1317 and 1318 is to be observed.
Source: Code of Canon Law (Vatican.va)