What is the outcome of Victor's criminal trial? What evidence is provided to prove this?

Suspected of murdering his best friend, Henry Clerval, Victor is arrested and jailed for around three months while he languishes in illness and eventually begins to recover his health after Mr. Kirwin writes to and brings his father from Geneva to provide support for him.  Clerval's brutal strangling is yet another murder that we can attribute to Victor's creature.  In Victor's criminal trial, he is cleared of charges by the grand jury, with the help of Mr. Kirwin, and permitted to go free within about two weeks.  The primary piece of evidence used to prove that Victor could not have committed the crime is that he was in the Orkney Islands, an archipelago in northern Scotland, during the exact hour that Clerval's body was found.  In other words, Victor was too far away to commit the crime.