Another vote for stand and fight here. Something to keep in mind, which my ex and his entire camp seemed to overlook while arguing in mediation and then in court- only an alcoholic would argue that they should be able to drink while caring for children. I also sweetened the pot by offering to pay half the cost- unless he blew positive or missed a test, and kept the emphasis on our ensuring son's safety, which thwarted his claims of attempted parental alienation.
Good luck. We're all behind you 100% on this.