Final answer:
The Frye standard was established in the case of Frye v. United States in 1923. This standard determines the admissibility of scientific evidence in court based on its acceptance within the scientific community.
Step-by-step explanation:
The important principle that was established in the case of Frye v. United States from 1923 is known as the Frye standard. This standard is used to determine the admissibility of scientific evidence in court. It states that scientific evidence can only be admitted if it is generally accepted within the scientific community as reliable and valid.