This summary is not the rule. The rule text controls.
Here's a plain-English summary:
Any side in a court case can question a witness's honesty or reliability, even if that side is the one who originally brought the witness to testify. In the past, some courts followed a rule that said you couldn't attack the credibility of your own witness. This rule gets rid of that old idea.
This matters because sometimes a witness doesn't say what a party expected, or their testimony changes once they're on the stand. If that happens, the party who called them isn't stuck treating that testimony as reliable. They can point out reasons the witness might be mistaken, biased, or not telling the truth, just like the other side could.
In short, no one gets special protection from having their credibility challenged just because a particular party chose to put them on the stand.
