By Florida Law, under what circumstance may propane containers NOT be filled?

The circumstance under which propane containers may not be filled is when the container has visible bulges. This is a critical safety measure because bulges can indicate structural integrity issues, potentially leading to leaks or explosions if the container is overfilled or improperly handled. The risk of a safety hazard when dealing with gas under pressure makes it imperative that any container showing signs of physical deformity, such as bulges, is not filled and should be inspected or replaced instead.

Regarding the other options, they do not inherently indicate a safety risk related to the filling process. The visible capacitive mark serves as a guideline for filling but does not pose a danger on its own. If the owner is unavailable, the filling of the container could still proceed provided proper authorization protocols are followed. A container that is less than full typically does not present an issue for refilling as long as the fill level is managed properly and does not exceed safe limits.