Why didn't Jedi Council perform a Midi-chlorians test in the Senate?

By the end of Star Wars Episode 1: The Phantom Menace, Jedi Council knew that there's a Sith in existence (thanks to Yoda's knowledge of Rule of Two). By the end of the episode 2, Jedi Council knew that Darth Sidious was hidden inside the Senate (thanks to Count Dooku for that information).

Jedi also knew about Force Stealth. Why didn't they simply use the old-fashioned blood test to check midi-chlorians count?