A cautionary tale for sports parents with student-athletes wanting to test the waters of professional sports. The baseball draft works differently from football but the bottom line is that student-athletes and their families are responsible for knowing the rules to protect amateur status.
When in doubt, refer to your university's Professional Sports Counseling Panel, rather than an "agent" or "advisor," for advise on your son's marketability and prospects in the pros. Once a student-athlete loses his amateur status, he is done in that sport at the college level.
The NCAA Professional Sports Counseling Panel information is found in the NCAA Div I manual at section 12.3.4.
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http://www.cbssports.com/mlb/eye-on-baseball/24449174/report-phillies-turn-unsigned-draft-pick-in-to-ncaa-for-using-an-agent