The Statute of Limitations for a felony drug charge is generally three (3) years from the date of the offense. The State has that amount of time to obtain an indictment. 4 months is not that long for a drug case, because the laboratories used by the State to test the substance and confirm that it is drugs, are very busy and backlogged. Sometimesd it can take months, even a year or more, to obtain the test results.
The statute of limitations is usually the short answer, however a defendant's constitutional right to a speedy trial is also involved. With respect to drug cases, it is not uncommon for the State to sit on the case while the Feds take a look as to whether they want to pick it up.
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