In Breaking Bad: S03, when Walter White suspects that Jesse may be stealing meth from the lab, he didn't say it in the lab itself, but outside the factory as he suspects there could be sound recorders in the lab. This may also be seen in further episodes when he hushes Jesse.
But he never suspected or mentioned that there could be video cameras as well. Why?
Video/surveillance cameras are far more common. Still, if someone will keep sound recorders to keep surveillance, isn't he going to put a video camera to keep an eye as well? In which case, they would have caught Jesse stealing anyways. And if there were no camera, I think there are remote chances that there will be sound recorders as well. Why didn't Walt think this way?
One thing I can think of is that his house had been bugged by Saul before, so he may have that incident in mind. But that is his house and that's why cameras can't be installed. Gus can install them very easily in his own lab.
What else could explain this?