not get persisted to the data store

Can anyone see why when i set driverstatus.activeStatus = false; this does not get persisted to the data store?

Query stopalertquery = pm.newQuery(Driver.class); 

stopalertquery.setFilter("mobileCarrierEmail == mobileCarrierEmailParam");

stopalertquery.declareParameters("String mobileCarrierEmailParam"); // check open status

List<Driver> driverInactiveresults = (List<Driver>) stopalertquery.execute(sendToEmail);              if (driverInactiveresults.iterator().hasNext()) {

log.severe("number of drivers foud : "+ driverInactiveresults.size());

for (Driver driverstatus : driverInactiveresults) {

driverstatus.activeStatus = false;

pm.makePersistent(driverstatus);

}

}

stopalertquery.closeAll();

pm.close();

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