I'm Doug, and I'm very sorry to hear of your son's situation. My goal is to provide you with excellent service today.
Yes, you really should get your son an attorney for this citation. While possession of less than an ounce of pot is a civil offense and a $100 fine, possession of paraphernalia is punishable by up to 2 years in jail under MA laws. And while jail is highly unlikely, he will want to make sure that it is not a possibility, a fine of $500 to $5,000 is also possible. If this is a first offense for your son, it is possible that the matter can be resolved with no mandatory sentence and no criminal record.
Here is a link to the state law:
So, yes, he would be much off being represented by competant legal counsel.
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I wish you the best in 2013,