When to put new ball into play after HR?

[BHBlue]

Originally posted by AtlUmpSteve
Now, the NCAA specifically tells us NOT to throw a ball to the pitcher after a ball has been fouled out of play; we are mandated to hand that ball to the catcher. How/why is this different? Yeah, I know Emily is the guru, but isn't some consistency in order?

Please enlighten us as to where you heard or read this "mandate".