(SPRINGFIELD) Illinois lawmakers are weighing legislation to prevent synthetic marijuana manufacturers from dodging laws banning the substance. The Chicago Tribune reports that the State Senate passed a bill this past week to ban all types of synthetic cannabinoids instead of just specific formulas. The effort comes after public health officials recently reported that a fourth person in Illinois has died after using synthetic cannabinoids that authorities believed were laced with rat poison. Illinois has passed several laws in the past several years to ban synthetic marijuana, however manufacturers often change the formula to skirt the rules. This particular measure now moves to the State House of Representatives for consideration there.