USPS 1st class not turning off...

For some reason items with a weight over 0.5lbs are going through with first class as the shipping option.
We have to eat the shipping cost to upgrade to priority since USPS only allows first class packages to be 8oz or less.

I should be able to turn off first class using a simple check like:

if($shipping_weight > 0.5) { turn off first class };

just not sure what code to use to turn off the first class option or where I should place it...

Ok I think I figured it out but would love some confirmation....

at line 553 of USPS.php

// BOF: UPS USPS
      // bof add in first class check
          if ($shipping_weight > 0.5) {$domestic_types= (EXPRESS, PRIORITY);}
		else {$domestic_types=MODULE_SHIPPING_USPS_TYPES;}
	  $allowed_types = explode(", ", $domestic_types);
          //$allowed_types = explode(", ", MODULE_SHIPPING_USPS_TYPES);

well that check did not work... but it all becomes a mute point! Our shipping program just updated and it is allowing first class parcel up to 0.8lb, as it should have before.

The $shipping_weight is not available to you, where you are checking it so it evaluates as 0 ...

Above the IF in your code, add:

global $shipping_weight;

See if that doesn't work for you, to get this working the way you need it to ...

NOTE: I am not seeing the 8oz limit you refer to on the USPS site:
https://www.usps.com/send/first-class.htm