What does PDA mean in schools?

Public Displays of Affection (PDA) are often seen in the halls of every high school. Although PDA can include a wide range of actions, school administrations are still attempting to control them. Throughout the country, policies vary in their acceptance of PDA. Some ban hugs or hand holding, while others allow kissing.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.

explanation:

a trial judge has broad powers in his courtroom. the judge's decision is usually final for the duration of the trial, and the party's one special type of witness is an expert witness.