Answered by Our Attorneys

Will Medical Marijuana Cost Me Custody in New York?

By Pieter G. Weinrieb, Esq. · Divorce & family law attorney, Williamsville, NY · Updated July 17, 2026

The short answer

Not by itself. Since New York legalized adult-use cannabis in 2021, lawful use — medical or recreational — is treated like lawful alcohol use: it is not a basis to deny custody or parenting time on its own. What still matters is impairment during parenting time, unsafe storage, driving, and whether use is affecting your parenting. That’s where these cases are actually won and lost.

What Changed in 2021

The Marihuana Regulation and Taxation Act (MRTA) legalized adult-use cannabis in New York and did something directly relevant to family court: it amended the Family Court Act’s neglect definition so that a parent’s cannabis use, standing alone, does not establish neglect. A caseworker or a judge needs evidence that use actually impairs your ability to care for your child — the same way a glass of wine at dinner is not neglect but being too drunk to supervise a toddler is.

Medical marijuana patients have the additional footing of a lawful, physician-supervised treatment. Using a certified medical product as directed is not a parenting defect, and New York courts are not permitted to treat certified patients as presumptively unfit.

What Judges Still Care About

Custody in New York turns on the best interests of the child — a case-law standard, not a statute with a marijuana checkbox. In practice, here is what I’ve seen move the needle in Erie and Niagara County courtrooms:

Impairment during parenting time. The question is never “do you use?” It’s “are you impaired while you are the only adult responsible for the children?” Medicating right before or during your parenting time invites exactly that question.
Driving. Driving impaired with children in the car will do more damage to a custody case than almost anything else you could do. It also carries criminal exposure. Treat it as an absolute line.
Storage. Edibles look like candy. A toddler ER visit for accidental ingestion is a custody case-ender and a CPS case-starter. Locked, out of reach, always.
The children’s exposure. Smoking around the children, visible paraphernalia, a home that reeks — judges are human, and this shapes their picture of your household.

How These Fights Actually Unfold

The typical case is not CPS at the door. It’s the other parent’s attorney raising your use in a custody or modification proceeding, asking the court for testing or restrictions. Two things decide how that goes: documentation and moderation. A medical certification, a consistent treatment relationship, and use patterns that clearly separate medicating from parenting are a strong defense. Daily heavy use you cannot document as treatment, with fuzzy boundaries around the kids’ schedule, is a weak one.

Be ready for the double standard, too: a parent who drinks three beers a night will confidently attack your prescribed cannabis. The law treats both substances the same way — through their effect on parenting — and a good attorney makes the court see the symmetry.

Mistakes I See Parents Make

Lying about use in a deposition or to a forensic evaluator — the use was never the problem; the lie becomes the case. Agreeing to broad “no cannabis” stipulations under pressure that a court likely wouldn’t have imposed — once it’s in your order, it binds you and violations are contempt. Posting use on social media mid-litigation. And treating a CPS visit casually: even though cannabis alone is not neglect, cooperate carefully and call a lawyer the same day.

A Western New York Note

Local practice varies from part to part — some judges came up before legalization and their instincts show. If your use is being weaponized in a custody dispute in Buffalo, Williamsville, or anywhere in Erie or Niagara County, get local custody counsel who knows the courtroom, and read our related guide on DWI and custody if driving is any part of the allegation.

Frequently Asked Questions

Can CPS take my kids because I use legal marijuana in New York?

Not for lawful use alone. Since the 2021 MRTA, a parent’s cannabis use by itself does not establish neglect under the Family Court Act — there must be evidence that use actually impairs your care of the child. Impairment while supervising children, unsafe storage, or driving impaired are different matters entirely.

Does a medical marijuana card protect me in a New York custody case?

It helps. A physician-supervised certification frames your use as lawful treatment, and courts cannot treat certified patients as presumptively unfit. But a card does not excuse impairment during parenting time or unsafe practices around children — the best-interests analysis still controls.

Can a judge order drug testing in a New York custody case?

Yes. Where a parent’s substance use is genuinely in issue, courts can order testing or condition parenting time on it. Whether cannabis testing is appropriate — given that THC lingers long after impairment ends — is something your attorney should litigate rather than concede.

Can my custody agreement ban me from using legal cannabis?

If you agree to it, yes — parents can stipulate to restrictions stricter than the law requires, and once so-ordered, violating them is contempt. Think hard before signing a blanket ban a court probably would not have imposed on its own.

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