In 1919, the National League approved the banning of the spitball. The initiative, led by Pirates owner Barney Dreyfuss, included a grandfather clause, which allowed current spitballers to continue throwing the pitch. The following year, the American League followed suit and adopted the rule as well.
I didn’t know gaylord perry was that old. Just kidding. The spitball is like the 11th commandment. Thou shalt not get caught.