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Complete mess on the stand. i think as a prosecutor, i would argue she was the same mess on the streets, that perhaps she had no business being out there to protect the public and to serve, and that she should have had a desk job. frankly, she had no experience with these weapons that were deadly. >> the prosecution showed potter's tasers and guns side by side, and walked through the extensive training she had on not mistakenly grabbing the wrong weapon. i mean, that, i thought was a compelling part of the testimony. i mean, she was trained to know better. >> she was trained to know better. so...

Nbc's shaquille brewster is live outside the courthouse in minneapolis. shaquille, court is back in session. what do we know today? >> reporter: of course, we're waiting to see when kim potter will take the stand, but the defense has called as their first witness for today, dr. lawrence miller. he's a psychologist and the defense is bringing him up to help the jury understand their perspective of what they say happened. we're going to hear terms like action error, slip and capture, we had the psychologist up to explain why they believe kim potter reached for her gun when she thought, she says,...

He testified about this phenomenon called action error. in plain language, he said, it means you intend to do one thing, you think you're doing that thing, but you do something else and then you realize later the action that you intended was not the one you took. he gave several examples of this. one example in particular he talked about writing down the date at the start of a new year. instead of writing the current year that you're in, you might write the previous year because that's what you're used to doing. that muscle memory. he said this comes -- that happens in a variety of fields, not...

Analyst and civil rights attorney and former prosecutor. shaq, let me start with you. again, court right now in recess. how soon could we expect to see potter on the stand? and what have we heard from the defense so far this morning? >> reporter: well, it's possible, craig, possible that potter will be on the stand in about 20 minutes when court resumes. we know the defense said that plan to call two witnesses today and they processed through the first witness. we'll keep an eye on whether potter is the first witness to be called. the first witness was a psychologist who the defense brought up...

Of procedures of the police department, but the defense so far has pulled up. we saw this yesterday. their own expert and the former police chief of the brooklyn center police department that said what kim potter did, even if she used the gun and meant to, even that was justified based on the policy and procedures. you're getting a sense the jury is getting a lot of evidence they're going to have to weigh when it's eventually in their hands. >> all right. shaq brewster outside the courthouse. thank you as always. christen, let's talk about this action error psychologist first as shaq mentioned...