Read it in the NCAA rules. I'll find it and paste for you.
See below, bybbio. What would truly be nonsense would be for the NCAA to grant athletes the relief of being able to transfer without penalty, but then allowing their current team to control whether (and to whom) they can talk to about it.
NCAA Bylaws - Excerpts
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For those interested, here are the applicable sections related to the transfer rules for student athletes as it relates to USC's players. I wonder how it affects a player like Glenn Stanley who bailed on the Vols...he probably had two years of eligibility in three years time.
13.1.1.3.3 Transfer from Institution Placed on Probation by Committee on Infractions. It is not necessary for an institution to obtain permission in writing to recruit a student-athlete at an institution that has been placed on probation with sanctions that preclude it from competing in postseason competition during the remaining seasons of the student-athletes eligibility. However, the student-athletes institution must be notified of the recruitment and may establish reasonable restrictions related to the contact (e.g., no visits during class time), provided such restrictions do not preclude the opportunity for the student athlete to discuss transfer possibilities with the other institution [see Bylaw 14.8.2-(c)]. (Adopted: 1/10/92, Revised: 1/9/06 effective 8/1/06)
14.8.2 Residence Requirement Waivers. The Legislative Council Subcommittee for Legislative Relief may waive the one-year residence requirement for student-athletes under the following conditions or circumstances: (Revised: 11/1/07 effective 8/1/08)
(c) On the recommendation of the Committee on Infractions, for a student-athlete who transfers to a member institution to continue the student-athletes opportunity for full participation in a sport because the student athletes original institution was placed on probation by the NCAA with sanctions that would preclude the institutions team in that sport from participating in postseason competition during all of the remaining seasons of the student-athletes eligibility (see also Bylaw 13.1.1.3.3); (Revised: 1/10/92)