Costello Law Firm represents corporations, businesses, and professionals in highly regulated industries. We assert and defend our clients’ interests outside and inside the courtroom. We defend clients during government audits and investigations, help clients respond to whistleblower claims, and conduct internal investigations. Our extensive experience includes:


Costello Law Firm represents businesses involved in civil claims or alleged violations including:

• Fraud
• Breach of Contract
• Lease Violations and Real Estate Litigation
• Trade Secret Disputes


Businesses are subject to dozens of local, state, and federal regulations governing their relationships with their employees. These include the Fair Labor Standards Act, Affordable Care Act, Family and Medical Leave Act, Americans with Disabilities Act, and regulations concerning workplace safety, violence, and sexual harassment. Costello Law Firm is experienced in representing and assisting businesses facing employment law actions.


Costello Law Firm can help our clients determine whether they are adhering to applicable laws and regulations. This helps guard against litigation, employee malfeasance, and government enforcement investigation audits and actions. We provide legal opinion letters, ongoing advice, employee manuals, and tools to manage compliance with complex city, state and federal laws. We can report on compliance, recommend changes to internal systems, and monitor future best practices.


Companies initiate their own internal investigations for a wide range of reasons. These can include allegations of employee misconduct, external claims of employee malfeasance, and internal whistleblower complaints. Misconduct might involve sexual harassment, accounting fraud, manipulation of data, or theft.

We are experienced investigators who can make effective inquiries. An investigation can include interviews with employees and collection and examination of evidence. If needed, we recommend corrective action, including future compliance monitoring. A quality internal investigation and appropriate response may help forestall further action by regulators or prosecutors.
(206) 749-5020
200 First Ave West, Suite 306
Seattle, WA 98119