Bebeto Matthews / AP

Eyewitness testimony is considered one of the most valuable elements of a criminal investigation, but our memories are often wrong — 70% of convictions overturned with DNA evidence contradicted eyewitness testimony — because of how our brains process information, per Ars Technica.

How an eyewitness goes wrong: A study at the Salk Institute for Biological Studies found that our memories of traumatic events can often be based around our expectations of that event — for example, if a robbery occurs, a witness might say that they saw a gun simply because they expect one to be present. And memories can be slightly altered with each successive recall of an event as eyewitnesses try to create a picture that makes sense, rather than what they actually saw.

How to fix the process: The study pegs the initial suspect identification in a lineup as a primary point of focus, suggesting it should be administered by police with no connection to the case, videotaped for the future, and contain specifics on the witness' confidence level.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 9:45 p.m. ET: 19,282,972 — Total deaths: 718,851 — Total recoveries — 11,671,491Map.
  2. U.S.: Total confirmed cases as of 9:45 p.m. ET: 4,937,441 — Total deaths: 161,248 — Total recoveries: 1,623,870 — Total tests: 60,415,558Map.
  3. Politics: Trump says he's prepared to sign executive orders on coronavirus aid.
  4. Education: Cuomo says all New York schools can reopen for in-person learning.
  5. Public health: Surgeon general urges flu shots to prevent "double whammy" with coronavirus — Massachusetts pauses reopening after uptick in coronavirus cases.
  6. World: Africa records over 1 million coronavirus cases — Gates Foundation puts $150 million behind coronavirus vaccine production.

Warren and Clinton to speak on same night of Democratic convention

(Photos: Abdulhamid Hosbas/Anadolu Agency via Getty Images, Sean Rayford/Getty Images)

Sen. Elizabeth Warren and Hillary Clinton both are slated to speak on the Wednesday of the Democratic convention — Aug. 19 — four sources familiar with the planning told Axios.

Why it matters: That's the same night Joe Biden's running mate (to be revealed next week) will address the nation. Clinton and Warren represent two of the most influential wise-women of Democratic politics with the potential to turn out millions of establishment and progressive voters in November.

Trump considering order on pre-existing condition protections, which already exist

Photo: Jim Watson/AFP via Getty Images

President Trump announced on Friday he will pursue an executive order requiring insurance companies to cover pre-existing conditions, something that is already law.

Why it matters: The Affordable Care Act already requires insurers to cover pre-existing conditions. The Trump administration is currently arguing in a case before the Supreme Court to strike down that very law — including its pre-existing condition protections.