Most of the times I have heard some news that some Nigerian caught with some kg of gold or drugs... may be that's why random Nigerian are on black list for India
What I am going to write now will surprise many people. Many years ago, Air India flight from Bombay to Lagos was stopped and confiscated for Drug smuggling between India and Nigeria. 3 employees of Air India were arrested by Nigeria Police and some members of Gujarati Community living in Nigeria were involved in smuggling racket.
Remember the year 1987 very well...the word 'drug/drugs' was very much in the air, particularly in West Bengal...it was not a common phenomenon then...stories were rife that packets of drugs were surreptitiously circulated to students in posh Kolkata schools and colleges...it was even rumoured that 'phuchkawalas' used to mix drug in their 'phuchkas' which resulted in many kids getting addicted...even in our school, St. Xavier's, there were wild rumours regarding drugs...I remember one of the senior students reportedly getting addicted to drugs and losing his mental balance, though it was denied later...even Bollywood (both masala films as well as parallel cinema) exploited this phenomenon to the hilt from the mid-80s to the mid-90s...the baddies were shown to be involved in smuggling of drugs
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Mb won't face any consequences
https://www.google.co.in/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=nigerian+caught+with+drugs+in+india
http://www.upi.com/Archives/1987/10/23/India-pays-32-million-for-release-of-crew/7755561960000/