HS football - what is the penalty for an illegal forward pass - past the LOS. Is it 5 yds and a loss of down?...from what point? The LOS or point of infraction?

Five yards and a loss of down. Enforce from the spot of the foul.

Peace

Does this not seem odd? Why would the penalty not be inforced at the LOS?

Who knows and who cares?
 

Because "thems the rules." It is a spot foul, not a loose ball foul. You enforce it as subscribed by the rules. What is weird about that?

Peace

while it might seem odd, it's simply a matter of rule fact for enforcement of this foul.
Holding behind the NZ is enforced from the spot of the foul for NF games. Many find that odd as well.

I undersand that it is a rule...I am asking from a commeon sense point of view. Example: 4th and 1 yd for 1st down, QB rolls and runs past the 1st down marker then throws pass. Common sense says that the infraction happened when the player attempted a pass over the LOS, thus the LOS should be the determining factor. In the example, a first down would be awarded along with the 5 yd penalty.

Call me crazy, but some things don't make sense

Why would think there should be a 1st down awarded to team-A? It would had the illegal pass occurred 5 or more yards beyond the line to gain.

After penalty enforcement, if the team had not reached the line to gain, the loss of down part kicks in and rule not common sense says its 1st and 10 for team-B.

Previous spot for enforcement happens for legal forward pass plays not illegal forward pass plays.

The rationale here is that under Fed rules, an illegal forward pass is, for most purposes, not considered a pass at all, but a run. The basic spot for run plays is the end of the run, and no reason has been seen to make an exception.

It wasn't a foul for crossing the line of scrimmage. It was a foul for throwing the pass from beyond the line of scrimmage.

1/10 at A's 1. A1 runs 98 yards to B's 1 and then throws and illegal forward pass to A2 that falls incomplete. Is it fair to take the 98 yards he gained away from him?

What do you mean Bushref?
If team-B declines, the ball is next snapped by team-A at the B1 yardline.
Team-A is entitled to every yard it gained by the run.

Incorrect.
The spot of the illegal pass is the spot of next snap if penalty is declined.
It's in rule 7-5-3.

REPLY: The succeeding spot is the previous line of scrimmage only for incomplete <u><b>legal</b></u> forward passes.

Personal opinion: I believe a foul that occurs at the end of a period, that includes LOD, should also mean you lose the right to the untimed down. Maybe that's just me.

REPLY: Unless that LOD foul occurred on fourth down and would turn the ball over to B for the untimed down. Right?

Actually no. It's kind of strange that it does.