reads more like the judge is giving him due process of law but also setting him up. hes not gonna be able to grab the closest crackhead and call him an "expert witness." the ''expert witness" is going to have proof that he/she is an "expert witness" as in probably someone that does hair follicle testing on a regular basis.
id think your atty would know the judges tendencies and this probably isnt the first time the judge has had this situation.