iOS - check if bluetooth is on without system alert popup to user

This code allows to determine current bluetooth status:

CBCentralManager* testBluetooth = [[CBCentralManager alloc] initWithDelegate:nil queue: nil];


switch ([testBluetooth state]) {....}

But, when [[CBCentralManager alloc] init...] happens, system popups an alert to user, if bluetooth is off.

Is there any way to check bluetooth status without disturbing my users?