Originally Posted by Often1

You can certainly apply for a redress #, but you should understand that the "SSSS" system has completely different uses for flights headed to the US as opposed to TSA screening at US checkpoints.

For flights headed to the US, DHS requires that a significant % of passengers be subjected to secondary screening and those passengers are selected both randomly and from various lists.

While TSA does select some minimal % of all passengers screened at its checkpoints at random for various types of secondary, most are selected for their presence in one or another database or features of their ticket. But, again the overall % are way lower than for international departures to the US.