How To Prove Substance Abuse During a Divorce
Posted in Divorce on October 5, 2025
When you decide to end your marriage, a divorce lawyer can guide you through the proceedings and address common questions or concerns. For some individuals, drug or alcohol use plays a key role in their divorce. This could ultimately affect the proceedings in several ways.
Find out how to prove substance abuse in divorce proceedings. Below, the legal team at Ratzer | Dobis outlines the impact of drug and alcohol use on divorce cases, as well as tips for gathering evidence in support of your claim.
How Substance Abuse Affects Divorcing Couples and Their Families
An addiction to drugs or alcohol can significantly alter a family dynamic. Couples who once excelled at communication and problem solving could endure ongoing conflict due to one partner’s addiction issues. In some cases, substance abuse could lead to instances of domestic violence.
Spouses affected by this behavior may believe that ending the marriage is the only solution. They want to feel safe in their home and put the stress of their fractured relationship behind them. Proving an addiction could be helpful in various aspects of a divorce.
Proving the Grounds for Divorce
California is a no-fault state, meaning you don’t need to prove any wrongdoing from your spouse in order to divorce them. However, at-fault states allow you to list specific grounds for divorce when filing. One common reason given in at-fault states is excessive substance abuse.
If someone lists their spouse’s history of alcohol or drug abuse as a motivating factor for their divorce, they must offer proof. Even in a no-fault state, you could benefit from knowing how to prove substance abuse in divorce proceedings.
Child Custody Arrangements
Providing evidence of substance abuse may have a tremendous impact on child custody arrangements. Couples who share young children will need to come up with a custody plan while navigating their divorce. If they’re unable to reach a resolution, the court may intervene.
Suppose your soon-to-be ex drinks alcohol in excess or uses illicit drugs. Doing so may cause erratic or even violent behavior, which you don’t want to subject your children to. You may question their parental fitness and request limited parenting time or visitation.
Family courts rule with the child’s interests in mind. If you can prove that ongoing substance abuse issues will affect your children’s welfare, the court may adjust the custody arrangement accordingly, though outcomes vary.
Protect your child’s interests while navigating custody arrangements. Work with a knowledgeable family law attorney to review your options and build a compelling custody case.
Asset Division
Divorcing couples have to split their marital assets equitably. But what if one spouse was feeding their addiction using shared funds?
Chronic drug and alcohol use isn’t cheap. Depending on the habit’s length and severity, someone could spend ample amounts of money on these substances. This may lead to a significant loss of marital assets, such as joint bank or investment accounts.
The affected spouse could try to prove the cost of the addiction in court. Depending on their unique circumstances, the court could consider granting an unequal division of assets.
Possible Evidence To Prove a Drug or Alcohol Problem During Your Divorce
If you ask a family lawyer how to prove substance abuse in divorce cases, they may offer several suggestions. The following pieces of evidence may not apply to your case, depending on your circumstances. Consult an attorney for a personalized legal strategy.
Relevant Medical or Work-Related Records
Substance abuse issues affect one’s health and safety. Medical records may reflect this and become key pieces of evidence in divorce or child custody cases. Examples include:
- Emergency treatment for a drug overdose
- Broken bones caused by a fall while under the influence
- Liver failure related to excessive drinking
- HIV diagnosis and treatment stemming from shared needles
It’s not just medical records that could support your claim. Workplaces could also document instances of drug or alcohol impairment.
For example, imagine a delivery driver exhibits signs of intoxication when they show up to work. As part of the company’s policy, their employer requires them to participate in an alcohol education program and undergo mandatory urine testing. Instances like this are worth mentioning to a legal professional if you’re trying to prove your spouse has a substance abuse problem.
Witness Testimony
If you’re wondering how to prove substance abuse in divorce proceedings, use various witness statements as evidence. Submitting court testimony offers insights into your spouse’s behavior and how it impacts your marriage and family.
You may submit your own statement, as well as use testimony from others, such as:
- Friends
- Family members
- Colleagues
Their words could help back up your claim.
Arrest History or Prior Court Orders
Your soon-to-be ex could have a history of legal trouble when it comes to substance abuse. If so, their prior arrests, convictions, or court orders could be significant evidence in your divorce or custody case.
Say your spouse is a heavy drinker and you want to limit their parenting time to protect your children from this dangerous behavior. If they have one or more DUI arrests on their record, a judge may take this into consideration when granting custody.
An arrest record doesn’t automatically prove a substance abuse problem, especially if the charge isn’t related to drugs or alcohol. This is when court orders come in handy. Any mandated participation in a drug or alcohol treatment program helps support your claim.
Financial Statements
If you’re wondering how to prove substance abuse in divorce cases, your bank statements could be crucial. Some individuals may not have prior arrests or official documentation citing a substance use issue. In addition to witness testimonies, financial statements could help highlight a drug or alcohol addiction.
Suppose your credit card bill shows multiple liquor store transactions over a short period. Perhaps there are unusual cash withdrawals from your joint bank account that you suspect went to purchasing illicit substances. Submitting these documents, in addition to other pieces of evidence, may warrant a judge to order a drug test.
It’s possible for you to finalize the divorce with more assets than your spouse, given their spending to fuel their habit. Bear in mind that this is not a certain outcome, and every case varies.
Are Drug and Alcohol Testing Mandatory During Divorce Proceedings?
You can’t just claim that your spouse has a substance abuse issue without evidence. The court may not give your claim much merit unless you provide substantial proof. After reviewing the evidence, a judge may order a chemical test to rule out significant issues with habit-forming substances.
Drug and alcohol testing is not the standard in California divorces. However, if a judge mandates one or both spouses to submit to a test, they must comply.
Consult an Experienced Divorce Attorney for Guidance
Knowing how to prove substance abuse in divorce may not always be necessary in a no-fault state like California. However, providing evidence of a spouse’s addiction could impact child custody arrangements and overall divorce proceedings.
If you need a knowledgeable divorce lawyer to assist you with the process, turn to the team at Ratzer | Dobis. We handle various family law cases, including divorce, domestic violence restraining orders, and more. Reach out to us today to discuss your options.
Call (858) 567-1992 or connect with us online to schedule a free consultation.