KRviator...Fault Detection and Exclusion is the guarantee on integrity.
In the US, GA aircraft run on UAT, a data transmitter for their ADS-B. It is not a transponder. Therefore, it will not be seen by TCAS equipped aircraft. Hence mode C as a requirement.
Sunfish, plenty of electrons have been murdered in the name of ADS-B. Perhaps, a search of PPRUNE is in order?