What is the legal test for the admissibility of a newly developed scientific opinion?

The high-water mark against admissibility of newly developed scientific opinion is probably Frye v. U.S., 293 E 1013 (U.S.S.C., 1923), where it is stated, at p. 1014: Just when a scientific principle or discovery crosses the line between the experimental and demonstrable stages is difficult to define. Somewhere in this twilight zone the evidential force of the principle must be recognized, and while courts will go a long way in admitting expert testimony deduced from a well-recognized scientific principle or discovery, the thing from which the deduction is made must be sufficiently established to have gained general acceptance in the particular field in which it belongs.