About us.

For professionals evaluating new business partnerships, M&A opportunities and business transactions, CS Business Screen is a decision intelligence company that provides peace of mind through comprehensive due diligence investigation reporting for both executives and companies that’s both simple and exhaustive.

What we do,
and who we do it for.


– Business Relationship Screening
– Pre-Investment Due Diligence
– Company Officer Screening
– Customer Due Diligence (CDD)
– Enhanced Due Diligence (EDD)
– Know Your Customer Screening (KYC)
– Anti Money Laundering (AML)
– Mergers and Acquisitions Due Diligence
– Investigative Due Diligence


– Private Equity / VC Firms
– Procurement Executives
– Financial Services Firms
– Brokers and Dealers of Securities
– Dealers in Precious Gems and Metals
– Law Firms
– Compliance Officers

Our story.

A fully licensed private investigation company and provider of national business background screening, CS Business Screen offers decision-making confidence without the complexity. Our founder, Dennis Drellishak Sr, set out to provide comprehensive due diligence reporting that’s effortless to order and simple to interpret, and we’ve done just that every day since 1996.

What our client's have to say.

“I have been working with CS Business Screen for more than 2 years and their services have helped my organization to make very important decisions, allowing us to truly know who we are doing business with. The process is simple, the platform is user friendly and our account executive has always been prompt, courteous, knowledgeable and very professional.”

Anonymous Client in the Precious Metals & Minerals Market

What our client's have to say.

“We’ve worked with CS Business Screen since 2012 for both client on-boarding and HR Screening. They do a thorough job and are proactive in letting us know if there are any court delays. Their on-line system is very easy to use and we’re notified via email as soon as reports are ready. Their staff is professional and knowledgeable and provide exceptional service to our company. We highly recommend CS Business Screen!”

Anonymous Client in the Strategic Consulting Market

Explore Features.

See what sets us apart from the overcomplicated and impossible-to-decipher competition.

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