State v. Branson

¶7 Generally speaking, Haseltine prohibits a witness at trial from testifying about the veracity of another witness. In Haseltine , we concluded that it was error to allow a psychiatrist to testify that there "was no doubt whatsoever" that a child witness was an incest victim. Haseltine , 120 Wis. 2d at 95-96. We explained that such testimony "goes too far" because it is "an opinion that [the victim] was telling the truth." Id. at 96.

¶8 We later applied this principle to a lay witness's testimony in State v. Echols , 2013 WI App 58, 348 Wis. 2d 81, 831 N.W.2d 768. In Echols , a witness who…