It wouldn't surprise me if they were all playing live over recorded tracks that also included their parts. Thanks to all the wigglin' chicks and Madonna, every show now has to be a huge production otherwise they won't sell tickets.
There are exceptions (home grown boy Bruce comes to mind) but many use "tricks" live. Depending on the songs, the Police in the 1980s had the bass tech play on several songs that Sting played the Zeta stand-up bass over. The Rolling Stones actually use a second drummer for Charley Watts. If you watch the live shows you can see them usually hidden somewhere behind the stage or near a big obstacle. My all-time bass god Brian Wilson plays bass on a few songs when he tours, however the bass line is also usually played by the keyboard guys.
Shame. It used to be you went to see a band live to see them play. And you used to get totally different versions live. Now all you get is what is on the recorded version.
Unless of course, you come hear me. I'm live, clammy and don't care...