well ... there is not only toilet waste to eject, but also garbage.
And garbage is the most important part, in weight and volume.
When you have some package floating with foreign language on it, you could imagine there is some unexpected foreign ship around, and if you have nothing on radar ...
The history of garbage is not fiction, it happens, and this conduct french navy to introduce a special process to avoid it anymore, 30 years ago.
I don't know about other navies ... but I suppose they do the same.
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