HC, you read this translated article for a start: 700 tons of smuggled vegetables circulate in Hong Kong markets affecting local business and endanger public health. The govt is aware of veg smuggling but is not doing much about it.
The SCMP has a paywall and The Standard doesn't report much real news but, if you can read Chinese, you can search Apple Daily online.
Here's are some examples:
ç‰›è‚‰å«è‡´ç™Œç‰©ã€ è‚‰æª”ä¸‰åº¦é•è¦ (fresh beef being sold in Tseung Kwan O with SO2 added to it at unsafe levels as a preservative and to make it look fresher than it really was)
æƒ åº·è³£æ¯’èœã€€ city\'superé›ªç³•å«èŒ (Cadmium-laced lettuce and mushrooms among other problems)
34æ¬¾æ±æ–¹é…’ä¸å®œéŽé é£²ç”¨ ç´¹èˆˆèŠ±å½«å«è‡´ç™Œç‰ æœ€é«˜ (Ethyl carbamate in wine imported from the Mainland)