No mention of drisha vchakira. Same goes according to Tosfos that we learn from vsafra la. There is no need to ask how she knows.
Why would you need דרישה וחקירה? It’s talking about when they’re giving first hand uncomplicated information, I shechted this meat, I was menaker, etc.
That is NOT the same thing as saying “it’s kosher” which can mean blessed by a rabbi, or I shechted the cow, and anything in between.