dash_riprock wroteThe potential problem is when the fielder raises his glove/mitt to show you the ball (after you've directed him to do so), and the ball pops out. Now you have a no-tag, and it's all your fault.
It is the umpire's job to find the ball, unassisted.
Please tell me you're not one of those "Voluntary release can last for 30 seconds" guys. Had a partner try to tell me (and enforce!) that if an outfielder catches a ball, then jogs in toward his dugout and the ball falls out near the mound, it wasn't a voluntary release, therefore not a catch.
The player makes a catch or tag, then loses the ball on subsequent action, it's still a catch/tag. "Voluntary release" is a guide on a banger, it doesn't last forever.