Pre-script: this case is now known as Case T-198/12, and on 15 May 2013 the Court by way of interim measure ordered the Commission to grant approval to the German measures in full, at least until such time as a judgment on the substance has been issued. It made specific reference to the precautionary principle. The ECJ eventually held in May 2014.
I have always thought of legislation on, and trade in, toys, as a perfect illustration for many regulatory mechanisms worldwide. Prof Francis Snyder’s work (see e.g. here) is a perfect illustration of same.
This is no different for the general workings, and finer mechanics, of EU law. Once more, the sector hands teachers and practitioners of EU law a perfect illustration of harmonisation techniques, exhaustion (pre-emption) arguments, and judicial review.
On 1 March 2012, the European Commission only partially (and temporally) granted Germany approval for upholding stricter limits on limit values for lead, barium, arsenic, antimony, mercury, nitrosamines and nitrosatable substances in toys (for the decision, see here) [As an aside, it is often said that one should never watch laws and sausages being made. Reading that list of substances, prima facie (only) one might want to add toys to that list]. Germany has announced it will appeal that decision with the Court of Justice of the EU.
I can think of one or two areas for discussion: risk management and migration limits v bioavailability (or the cheese and chalk argument); limits to pre-emption; application of the ‘environmental and health guarantee’ of Article 114 TFEU, including the principle of proportionality. Expect that future judgment to feature in core readers of EU law.