The answer depends on the circumstances of the case such as what crime was allegedly committed, whether the district attorney has already filed charges and your friend doesn't know about it yet, or the store didn't know about the crime until a later date. Generally in most misdemeanor cases, the DA has one year to file charges and in a general non-serious felony case they have three years.
Of course your friend can still be arrested depending on the crime, the statute of limitations for that crime, and when the crime was actually discovered or reasonably should have been discovered.
Mark A Seif,
Attorney at Law