There are three levels of tainting:

1. No tainting at all. This is the default.
2. Warning level tainting. This is enabled by using the -t switch. It's new in 5.8.0. When using tainted data in a possible insecure way, a warning is issued. This is in no way "safe", and just a debugging tool.
3. Normal taint, enabled by using the -T switch. Here using tainted data in a possible insecure way triggers a fatal error.

I've no idea what you mean by a saint level.

Abigail