A Former Employee Is Violating Their Non-Compete Agreement (Missouri)

So treat this like the time-sensitive problem it is. Confirm your agreement is enforceable, lock down the evidence, put the employee (and their new boss) on written notice, and move for an injunction before the damage compounds. This guide walks you through it in the order that actually protects your business.

First, confirm your agreement is actually enforceable

Before you spend a dollar on litigation, read the signed document and test it against Missouri's rules. A non-compete you can't enforce is worse than none — it can invite a fee award against you.

• Pull the signed original. You need the actual executed agreement with the employee's signature, not a template or a draft. Confirm the dates, the term, the geography, and exactly what conduct it restricts.
• Confirm a protectable interest. Missouri enforces a non-compete only to protect trade secrets, confidential information, or customer relationships and goodwill — not ordinary competition or the employee's general skills. "They're good and now they work for a rival" is not, by itself, protectable.
• Check the scope for reasonableness. Under § 431.202 and Missouri case law, the duration (one year is routinely upheld, two often acceptable), the geographic reach, and the range of restricted activity must be no broader than necessary. A nationwide, indefinite ban on working in your industry is a red flag.
• Watch the carve-outs. The statute does not let you bind an employee who provided only secretarial or clerical services. Make sure this worker had access to the kind of information or customer relationships the law protects.

If the agreement is overbroad, don't panic — Missouri courts can "blue-pencil" (modify) an unreasonable restraint and enforce a narrowed version rather than throwing it out entirely.

Preserve the evidence before it disappears

Injunctions are won on proof, and proof has a way of vanishing once a former employee knows you're watching. Lock it down immediately.

• Document the breach. Save anything showing the employee competing or soliciting — emails from customers who were contacted, the competitor's announcements, LinkedIn posts, sales you've lost, dated and screenshotted.
• Preserve their old devices and accounts. Do not wipe and reissue the laptop, phone, or email account they used. Image the device and freeze the email so you can show whether they took files, customer lists, or confidential data on the way out.
• Identify what they took. If they downloaded customer lists, pricing, or confidential files before leaving, that supports a separate trade-secret claim under the Missouri Uniform Trade Secrets Act (RSMo § 417.450) — a claim that stands on its own even apart from the non-compete.
• Map the customers at risk. List the specific accounts the employee handled and is now contacting. Courts respond to concrete, named harm far better than to a general fear of competition.

Move on this in days, not weeks. Spoliation hurts your case, and gaps in your evidence are exactly what the other side will exploit.

Send a cease-and-desist — and notify the new employer

A firm letter often stops the breach before you ever file, and it builds the record you'll need if it doesn't.

• Write the former employee. Identify the agreement, describe the specific conduct that breaches it, and demand they stop immediately — cease soliciting your customers, cease the competing work the covenant bars, and return any confidential materials. Give a short, firm deadline.
• Write the new employer too. They may not know your former employee is bound, and a company that knowingly helps an employee break a valid non-compete — or uses your trade secrets — can be liable to you for tortious interference with your contract. Putting them on written notice removes their "we had no idea" defense and often pressures them to sideline the employee.
• Keep it accurate and professional. Overstating an unenforceable restriction can backfire. Describe real obligations and real conduct. Send it in a way you can prove was received.

These letters create a paper trail showing you acted promptly — which directly supports the "irreparable harm" and good-faith elements when you ask a judge to step in.

Move quickly for injunctive relief

The remedy that actually stops ongoing damage is a court order, and Missouri courts can issue one fast when the facts justify it.

• Seek a TRO and preliminary injunction. A temporary restraining order can halt the conduct almost immediately, followed by a preliminary injunction that holds while the case proceeds. To win, you generally must show a protectable interest, a reasonable covenant, a likelihood of success, and irreparable harm that money alone can't fix.
• Show why damages aren't enough. Lost goodwill, customer relationships, and disclosed trade secrets are the classic irreparable harms — they're hard to value and hard to undo. That's your strongest ground for emergency relief.
• Don't sit on your rights. Delay is the fastest way to lose an injunction. A judge asked to call something an "emergency" will reasonably wonder why you waited months. Filing promptly is itself evidence the harm is real and ongoing.

Because these hearings are measured in days, get the filing prepared while your evidence is fresh.

Quantify your damages and build the full claim

An injunction stops the bleeding; damages make you whole. Pursue both, and consider every claim the facts support.

• Calculate the loss. Track lost sales, diverted customers, and the value of relationships or information taken. Tie each dollar to the breach.
• Layer the trade-secret claim. If confidential information was taken or used, the Missouri Uniform Trade Secrets Act (RSMo § 417.450) allows injunctions and damages independent of the non-compete — useful insurance if any part of the covenant is challenged.
• Pursue the new employer where warranted. A tortious-interference claim against a competitor that knowingly induced or exploited the breach can add a second defendant — and a second source of recovery.

Frequently Asked Questions