The Rav Hamachshir believes that the insects can read the packaging.
BTW- The packaging is very deceiptive, "no checking necessary, אין צריך בדיקה" appears next to the Hashgocha. In some other print it says something about washing which the consumers don't read that part. Anyways it does not come off even after washing.
The whole heads of Romain Lettuce being distributed by the Bodek company is infested, washing per directions does NOT remove all of the insects. Therefore should NOT be used.