I don't think the 'war on drugs' has any relevance here. The cops could have come through the front door for any number of reasons. The problem lies with the cops ability to enter a citizens home unannounced.

This man was fully within his rights to defend his home, but shooting through a door at someone he can't see is problematic. However I understand the circumstances and think he should not be charged.

Maybe next time the nazi cops will think twice before barging in on a citizen in his own home.