When stink in shoes can be poisonous

When stink in shoes can be poisonous
http://businessmirror.com.ph/home/top-news/19333-when-stink-in-shoes-can-be-poisonous.html 

"A LOCAL waste and pollution watchdog on Thursday warned consumers that ordinary leather shoes they buy may be tainted with harmful substances that can adversely affect their health, as well as the environment."