It’s been covered before, but worth repeating…
Link: ‘Mind-blowing’ tidbit about public radio | JIMROMENESKO.COM
The majority of radio interviews (especially public radio) are pre-recorded, edited, tightened to take out “uhs” and “hmmms” and generally cleaned up before they air. Very rarely is a public official or person of interest put on live in news radio except during breaking news (and usually only reporters go live).