[wat10000]

Civilized countries don’t allow retroactively increasing the penalty for breaking a law. Does Germany allow that?

[ultrarunner]

The penalty doesn't have to be increased, it just needs to be selectively enforced.

[seba_dos1]

You'd need to have some unenforced penalty first though.

[victorbjorklund]

There is no penalty.

[gmueckl]

No, Germany punishes according to the laws at the time of the crime. It is not possible to retroactively enforce new criminal statutes.