Does the concurrent sentence doctrine apply to a conviction for possession with intent to distribute?

3 The government contends that, because the sentences for possession with intent to distribute are concurrent with those for conspiracy, and because the distribution sentences are consecutive to the conspiracy sentences, the concurrent sentence doctrine operates to preclude review of this issue. However, the possession and distribution sentences are consecutive to one another, so the concurrent sentence doctrine does not apply. Moreover, the doctrine is discretionary. We may choose to scrutinize the convictions notwithstanding concurrent sentences when appropriate. See United States v. Rodriguez, 546 F.2d 302, 308 (9th Cir. 1976).