Family relative got arrested on drug charges in Phnom Penh. Need lawyer recommendation and advice.

My family member got arrested while on a work visa in Phnom Penh for drug related crimes. It's looking more than likely that he'll be charged and sentenced for quite a bit of time there but I've been told that the prison isn't exactly the best. I was told that in order for a better experience in that prison, we would have to send him money but I'm not sure how to go about that.

Does anyone have any advice for this situation or know any reputable local lawyers that I can contact?

Edit to add: The charges were for sending weed which he claims that he did not know it was weed and was only instructed to drop the package off at the post office.