All relevant evidence is admissible, except as provided by law.
This statute establishes the fundamental starting point for admissibility. If evidence is relevant under the test in § 90.401, it is presumed to be admissible. However, the phrase "except as provided by law" is crucial. It means that relevant evidence can still be excluded if it is barred by another source of law, such as the U.S. or Florida Constitution, another Florida statute, or another rule within the Evidence Code itself (like the rules against hearsay or unfair prejudice).