Looks like he's in clear violation, esp. if on campus. Can extend to off campus if "conduct adversely or seriously affects the learning environment or University community."
Football player found with suspected murderers and a cache of guns may not affect the learning community, as I suspect little learning going on in that area. However it does adversely affect the university community.
https://www.lsu.edu/saa/students/codeofconduct.php
5.0 Jurisdiction of the Code
5.1 Jurisdiction of the Code
The Code applies to conduct that occurs on the Campus, at LSU-sponsored activities, and/or when the Student or RSO is representing LSU. SAA shall have discretion to extend jurisdiction over conduct that occurs off campus when the conduct adversely and significantly affects the learning environment or University community and would be in violation of the Code if the conduct had occurred on campus. In determining whether or not to extend jurisdiction, SAA may consider its ability to gather information. SAA may extend jurisdiction if the alleged conduct:
Involves violence or produced a reasonable fear of physical harm; and/or
Involves any members of the University community or any academic work, records, documents, or property of the University.
Each Student is responsible for conduct from the time of admission through the actual awarding of a degree, though conduct may occur before classes begin or after classes end, as well as during the academic year and during periods between terms of actual enrollment and even if the conduct is not discovered until after a degree is awarded.
5.2 Violation of Law and LSU Policy
Proceedings may be instituted against a Student or RSO charged with conduct that potentially violates both the law and the Code without regard to the status of any civil, criminal or other proceedings.
Proceedings under this Code may be carried out prior to, simultaneously with, or following any civil or criminal proceedings.
10.2 Behavioral Misconduct
A Student or RSO may be charged with Behavioral Misconduct for any of the following acts or omissions:
Weapons. Possession on one’s person, which includes any bag, case, container, purse, clothing, or backpack and/or use of any weapon, defined as any object used or designed to inflict or attempt to inflict harm or injury or fear of harm or injury. Weapons include, but are not limited to firearms, facsimile guns, air guns, knives, explosives, any dangerous chemical or biological agent or any other object or material capable of causing harm, and used by the offending person to inflict or attempt to inflict fear, harm or injury.