Chabbad-linked Rabbi Yirmiyahu Menachem Cohen, head of the rabbinical court in Paris, wrote a letter to Israeli Minister of Agriculture Yair Shamir, in which he stated that legislation in Israel to ban the import of the delicacy fois gras, the fatted goose liver produced by cruelly force-feeding geese, jeopardizes kosher slaughter in Europe.
After Rabbi Yirmiyahu Cohen's letter, the Israeli Rabbinate decided that the slippery slope argument for kosher laws was so legitimate that it would apply it to other aspects of religious life and laws.
For instance, the fur hats that many ultra-Orthodox sects wear will now be imported from animal farms that are known for having the most abusive and inhumane conditions and skin the animals alive.
Other ultra-Orthodox Rabbis even suggested that they should ban together with extreme Islamic Clerics to protect Female Genital Mutilation so that the EU will not ban the Brit Milah (male circumcision).
The Israeli Rabbinate, known for fearing the slippery slope and putting up strict laws to prevent its effects, said in a statement "the prevention of a ban on kosher slaughter is more important than violations of tzaar baalei hayyim (animal cruelty) laws."
Kosher slaughter was once thought to be the most humane way to kill an animal; however, research shows that there are much more progressive and humane ways. When the department responsible for providing Kashrut documents was presented with this information, they ignored the new information and stated that tradition was more important than the original meaning or intention.