Ineligible Receiver Downfield

[Mike246]

...before a legal forward pass that crosses the neutral zone is in flight.

Doesn't the NFL rule differ here in the case of screen passes? I.e., if a forward pass is thrown and it doesn't cross the LOS, a flag will be thrown if an ineligible lineman is past the ENZ.

In college ball, it isn't a penalty as long as the pass is completed behind the LOS. Here, it becomes
a penalty only when the forward pass crosses the neutral zone.