Foot on block during free throw

[womens_hoops]

Hi. Non-ref fan here trying to figure something out, and a half-hour of googling has come up empty, so i'm coming to the experts.

is there ever a time under any of the rules systems that a player can have her foot on the block during the free throw?

My understanding of the Men's NCAA rules is that the opponent of the shooter occupies the space between baseline and block, and he can't have his foot on the block. For women's, the lowest opponent occupies the space above the block, and she can't have her foot on the block.

What is the NFHS rule?

I vaguely recall that there was a proposal to change the NFHS rule last year (to match the NCAA women's, except you could have your foot on the block?) but it failed.

thanks much.