I need to see if an object that I have obtained from a CSV file with a unique identifier exists in my Core Data Database, and this is the code I deemed suitable for this task:

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity;
entity = 
[NSEntityDescription entityForName:@"ICD9"
            inManagedObjectContext:passedContext];
[fetchRequest setEntity:entity];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"uniqueID like %@", uniqueIdentifier];
[fetchRequest setPredicate:pred];
NSError *err;
NSArray* icd9s = [passedContext executeFetchRequest:fetchRequest error:&err];
[fetchRequest release];
if ([icd9s count] > 0) {
    for (int i = 0; i < [icd9s count]; i++) {
        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];
        NSString *name = [[icd9s objectAtIndex:i] valueForKey:@"uniqueID"];
        if ([name caseInsensitiveCompare:uniqueIdentifier] == NSOrderedSame && name != nil)
        {
            [pool release];
            return [icd9s objectAtIndex:i];
        }
        [pool release];
    }
}
return nil;

After more thorough testing it appears that this code is responsible for a huge amount of leaking in the app I'm writing (it crashes on a 3GS before making it 20 percent through the 1459 items). I feel like this isn't the most efficient way to do this, any suggestions for a more memory efficient way? Thanks in advance!