The early radio programs (1949 and early 50s), pre-Miranda, are interesting. Friday intentionally skirts the rules on warrants and lawyers, pressuring suspects to answer questions or conducting searches without a warrant if he doesn’t think there will be an objection. It’s very different from today’s reality or TV.
On Yesterday U S A . com —they have Dragnet radio episodes every other day for this year. A few weeks ago- one episode- Joe Friday loses his partner. Joe also has his “mother” for
some episodes.
So.... like Gunsmoke, I Love Lucy— the TV series spins from the radio show first.