Get a good attorney, preferably one who has expertise in DUI and drug cases. I would assume you must have had one for your last DUI????

That's the best advise you're going to get from anyone here. Its the only advise anyone can give. Don't pay attention to anything anyone else suggests. It could just make things worse. Only an attorney can advise you and properly represent you with this.

Oh, one other thing: keep your mouth shut. The less you say to the police the better.

Good luck.