[xPaw]

This looks enough for me

PHP Code:

#include <amxmodx>
#include <hamsandwich>

public plugin_init( )
    RegisterHam( Ham_CS_Item_CanDrop, "weapon_knife", "FwdHamKnifeDrop" );

public FwdHamKnifeDrop( iEntity ) {
    SetHamReturnInteger( 1 );
    
    return HAM_SUPERCEDE;
}