Spock, Scotty and others in “Unfinished Business”

Spock

Our spectro-readings showed no contamination, no unusual elements present.

Scotty

At least none your tricorders could register.

Spock

Instruments register only those things they're designed to register. Space still contains infinite unknowns.

McCoy

We're doing everything that's possible!

Kirk

Bones, I want the impossible checked out too!