Hi Dikran,
Anything is possible.
The "melamine in dairy products" scandal is widespread and ongoing. In September 2008 melamine was found by food testers in a range of mainland-produced sweets, including White Rabbit candy.
http://www.guardian.co.uk/uk/2008/sep/24/foodsafety.tesco
There's been lots of coverage of the ongoing problem of melamine in dairy products, but examples of recent reports on tainted products can be found here:
http://www.reuters.com/article/idUSTRE5B92GB20091210
And here:
http://www.reuters.com/article/idUSTRE5B92GB20091210
Personally I try to avoid anything locally produced containing dairy products.
Regards,
Dan