This mod prevents certain Sims from leaving jars with caught butter- or fireflies, and comes in two versions:

• -everyone – prevents everyone from leaving jars.
• -nonFamily – prevents unselectable Sims from leaving jars. Members of a currently played household don't leave jars only when they're within hotel grounds, on a community lot (like in the unmodded game), or on a secret lot (except for secret societies).

A jar that isn't allowed to be left on a lot is placed in the inventory of its owner, if they're a member of a currently played household (not a roommate). In other cases it disappears.
Use only one version at a time.

UPDATE (01 JUN 2020): Modified the -nonFamily version to make members of a currently played household not leave jars on secret lots, except for secret societies.

Conflicts
None that I know of.

Overriden resources

Resource name	Type name	Type	Group	Instance	Instance (high)
Anims - Objects	Text Lists	0x53545223	0x7FF5C46C	0x00000086	0x00000000
Sub - Set Down Jar	Behaviour Function	0x42484156	0x7FF5C46C	0x00001005	0x00000000

Credits
Ciastko
jfade (The Compressorizer!)
Creators of SimPe