Even when said as one thought with NO pause and NO change of the timbre of the voice, this construction takes two question marks.
…Were your car windows open? Do you remember?
…Was your radio on? Do you know?
Reversing the subject and verb in English is the indication that there is a question. These are questions — two questions. And if the answer is just “Yes” or “No,” refer back to the blog post of a few days ago for the follow-up that the attorney must then ask.