Auburn at Alabama (Illegal Pitches)

[Tex]

Watched the Auburn at Alabama softball game on March 24, on ESPNU.

In the bottom of the 3rd inning, Auburn's relief pitcher, who wore #1, doubled touched on every pitch.

Not a single illegal pitch was called from any of the 3 umpires. Do not understand as to why none were called.

Does anyone have any information as to when the illegal pitch of double touching became legal? I never received the memo!!