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Arson is a crime of general intent meaning that arson was committed "willfully and maliciously." All that's necessary for an arson charge is proof that the person intentionally started the fire. The criminal intent with arson is intent or purpose to start a fire, even if there's no intent to burn a structure. A fire inspector must then testify in court that he/she also suspected arson, and then an expert witness must be called to support the fire inspector's opinion.
If your boyfriend was under the influence of mind altering substances, you can argue that there was no intent. Given that there was no investigation, the evidence against your boyfriend seems to be circumstantial - and cannot be proven beyond a reasonable doubt.
You might also consider whether he was competent to stand trial.
M. Strisik, Esq.