Warning signs, such as this one behind home plate at Citizens Bank Park in Philadelphia, are standard in MLB stadiums. (Photo by Rich Schultz/Getty Images)

Sports leagues taking steps to further protect fans from balls, bats and pucks

Spending an afternoon at the ballpark comes with a warning on the back of the ticket. Whether they realize it or not, fans assume the risk of being hit by a foul ball or errant splinter from a broken bat. When balls enter the stands, fans clamor to collect a souvenir, but some.