The sideline warning fouls progress as follows two warnings, then a five yard penalty, then subsequent fouls are 15 yard penalties. I would say yes to incident report on a true 15 yard sideline warning sequence. Two unsportsmanlike fouls to a particular coach or to  individuals on a sideline warrant an incident report. Sideline interference which means unintentional contact with an official in the side zone or on the field  is a 15 yard penalty and I believe warrants an incident report.Intentional contact warrants, 15 yards, ejection and an incident report.

 
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