A wrinkle. I have just discovered that the company in question, Decision Diagnostics Corp., filed a Form 15 last year which they then withdrew.
That's a problem. They DID withdraw the Form 15 by filing a Form 1512G/A that said:
The Registrant hereby immediately withdraws its previous Form 15 filed by the Registrant with the Securities and Exchange Commission on April 22, 2015.
OTCMarkets apparently thought the second filing was a clarifying amendment rather than a withdrawal, because they don't realize the company is a delinquent SEC registrant.
Delinquency is always a danger, as the company may find out in a year or two. Or perhaps earlier, if they need to raise money.