Re: Homerun/Win Fireworks?
Probably a security concern, just like how fans were not allowed to bring baseballs into the baseball game.
Seriously, I had a brand new MLB baseball in my bag as I usually do just in case an autograph presents itself and I was told by security that I could not bring it into the game and I had to take it back to my car. I was like "What? Are you serious?" So then they told me yes that I could not bring it in because it was a safety hazard. So then I replied, "How will they be able to play the baseball game without a baseball?" which got me a dirty look so I retreated to take it back to my car.
I guess I can understand the logic but that didn't prevent fans from being able to purchase balls at the gift shop or catch balls during BP. I guess those were screened ahead of time but to not be allowed to bring a baseball into a baseball game is one of the most ridiculous things I have ever seen - especially when it was not on any of the "cannot bring in lists" published ahead of time (which I double checked).
I understand the heightened need for security as well as anyone else (probably better having worked 3 internships at a US AF base) but I sometimes just think security measures have gone overboard to the point that bad guys point and laugh because we cannot enjoy life as much.