Is there a way to find out if ex-roommate was using our money for stuff other than utilities in court?

We’re taking him to small claims court for not paying rent, trashing room and many other things. Before he moved out, a month before the power got shut off and when we called they said that it was due to lack of payments and late fees. When we first moved in the bill was $120 a month and when the power got turned... show more We’re taking him to small claims court for not paying rent, trashing room and many other things. Before he moved out, a month before the power got shut off and when we called they said that it was due to lack of payments and late fees. When we first moved in the bill was $120 a month and when the power got turned off he sent us the email saying it was $280. Obviously he’s been late multiple times for it to have kept going up every month and for it to be turned off. Is there something we can do to prove it and use in court?
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