Iterate through a player's pocket [DarkRP]

[RedNinja]

How does one go through the player's pocket and see if an item exists?

[lua]function( ply )
for k,v in pairs(ply.darkRPPocket) do
ply:removePocketItem(k)
end
[/lua]
For an example, this will empty one's pocket. How do I remove specific entities?
What should the if statement be? something like k:GetClass().

Thanks!