Although the impacts of carve-outs to managed behavioral health care organizations (MBHOs) and parity mandates on costs are largely settled in the literature, their impacts on access are less clear. Here we reexamine a study published by Samuel Zuvekas and colleagues in this journal, which found that the number of people receiving mental health/substance abuse treatment increased by almost 50 percent after the introduction of mental health parity and an MBHO. Using multivariate panel data methods, we now suggest that secular trends were largely responsible for this increase.