Abstract: A trash discriminator device (10) for a container (12) having an open top edge (14) which holds a plastic bag (16) therein, with an upper portion (18) of the plastic bag (16) folded over the open top edge (14) of the container (12). The device (10) comprises a barrier (26) placed over the open top edge (14) of the container (12) to allow trash to enter the plastic bag (16), while preventing a tray (24) to be deposited into the plastic bag (16). A structure (28) is for attaching in a removable manner the barrier (26) onto the open top edge (14) of the container (12) on the folded over upper portion (18) of the plastic bag (16), so as to hold the plastic bag (16) in place and stop the plastic bag (16) from sliding down into the container (12).