You've got to read the SEC filings covering any financing recently raised, look to see if it is a convertible instrument (debentures, preferred shares, etc), and if it is convertible, whether it is covertible at a fixed, or variable stock price. If it is convertible at a variable price and there is no floor on the conversion price, it is a floorless convertible.
They come in many different flavors, and often, the structure of the deal as described in the filing is so complex that I don't even bother trying to decipher them. IMO, the complexity is a tip off that something stinky is going on.