[skinnymuch]

Can't you ask for a case to be heard only by a judge? So the judge actually has to understand everything and go strictly by the law?

[pmyteh]

Depends on the jurisdiction (and the crime).

In the UK, for the most serious (indictable-only) crimes, then no. But you can ask the judge to end the trial after the prosecution case if no reasonable jury could convict, including if as a matter of law no crime has been committed.