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If he is indigent -- generally at or below poverty level -- he can plead not guilty at his arraignment tomorrow and ask the court to appoint him a public defender. The judge will adjourn the case for another date, and his lawyer will be there in court on the next date.
If he makes too much money to be eligible for a free lawyer, he can plead not guilty tomorrow at his arraignment and then tell the judge that he needs a continuance to retain an attorney because he didn't get the time to look for one. The judge will grant him an adjournment.
The plea of not guilty will keep all of his rights open until he can get his lawyer and be advised about the particulars of his case.
He can be charged with possession under a theory of constructive possession. That is, even though they didn't find it on him, he was in his truck and so were the drugs. That would give the prosecutor the right to try to prove that he knew the drugs were there and could have taken custody and control of them at any time. If the prosecutor can prove that beyond a reasonable doubt, he can potentially be convicted of this charge.
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