Absolutely. Just spray Nigaway! the second their smell is detected, which for the average white man, is long before they are seen. I was remiss in omitting another indicator...
Ya' know how dogs bark, cats faint, and birds flock up and fly in distress right before a major earthquake or other disaster? These are natural indicators of thug nigs in the area as well. Look for uncommon responses in nature. Hope this helps.
Remember, 2 for 1!
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