The United Supreme Court use the Daubert Guidelines to help determine if evidence is scientifically based.
Criteria:
(1) The evidence has been evaluated using the scientific method.
(2) The techniques and methods have undergone peer review, typically demonstrated by publication in a peer-reviewed journal.
(3) The principles involved are generally accepted by the relevant scientific community.
(4) The technique has standards that are applied consistently and reliably and the error rate is known or can be determined (has defined limits).
To be considered scientifically based all of the above criteria must be met.
