Requires the court to make a finding of fact of a special allegation, or a jury if it finds the defendant guilty find a special verdict as to the special allegation, if in a criminal case the defendant has been convicted of certain uniform controlled substances act provisions and there has been a special allegation pleaded and proven beyond a reasonable doubt that the defendant used or consumed, or allowed another to use or consume, certain controlled substances without a valid prescription in the presence of a person under the age of eighteen.