Right. This is how its going to go once Lowtax actually get her into court, unless Maplewife is sitting on something amazing; which if she was sitting on something that big, I'm not sure why she's hiding out in a women's shelter buying starbucks giftcards instead of letting him get destroyed in hearings.
The issue at hand which has gotten slightly lost is "Why has Lowtax recently taken a drug test"
I guess first off we all need to consider that lowtax is an unreliable narrator and could just be spinning some bullshit.
Assuming he isn't, the very likely speculation is he got one at the behest of his divorce lawyer. The reasoning for this is that Maplewife will likely try to make "He's a fucking ambien addict licking peanut butter off batteries and shouldn't be around my child" into that custody-altering bombsell.
@Ilmseil was making the correct point that Lowtax's piss test likely wouldn't rise to the level of verisimilitude required by criminal courts, I was making the counter point that Divorce court is not a criminal court, and since no one is going to jail and there is no hard evidence (like drug related arrests) linking Lowtax to actually being on drugs, the clean piss-sheet from a base-level employment screening lab will probably satisfy the judge.
And I'd previously speculated that if Lowtax's lawyer has that clean piss sheet ready to pull out in court, if Maplewife does make the charge of Lowtax being on drugs, it will look like his lawyer was expecting this claim and was ready to disprove it, which would be points against Maplewife because she'll look like she's vindictive and making shit up.