What two pieces of evidence confirm friar laurence’s tale about romeo and juliet?

Two pieces of evidence that confirm Friar Laurence’s tale about Romeo and Juliet were the letter he wrote to Romeo and the liquid which only made Juliet appear dead helped Friar Laurence’s case.

To add, Friar Laurence is a friar who plays the part of a wise advisor to Romeo and Juliet, along with aiding in major plot developments.