Suspected N Korea smuggling ships made repeated port calls in Japan

Japan's special law for regulating Pyongyang's shipping only applies to North Korean-flagged vessels.

Why doesn't this law apply to NoKo owned ships? That must have been too diffivult for the LDP to think of.

Port inspections of the vessels did not find any banned materials, according to the coast guard, though experts say such ships often appear to be engaged in legitimate operations and smuggled cargoes are not easy to find. There you have it - Japan bullies picking on DPRK again with NO EVIDENCE.

suspected...

again no proof, just buzz to create a conflict atmosphere

Can't be too many, crystal meth is a huge export for NK, and guns Japan does not have soo many. So aside from fish products and LV bags not such a problem. Just ram them at sea.

"Why doesn't this law apply to NoKo owned ships? That must have been too diffivult for the LDP to think of."

Because under international law the flag determines the nationality of the vessel and because the Chinese, at the UN, block closing the loop hole. That's why.

By that is it too  diffivult (sic) for you to use a spell checker?