I don't know how practical this will be, but I came up with this quick suggestion.
There's a little platform about 50 blocks above the spawn floor which only the cops have access to, maybe they can only gain access by typing /warp heli or something like that. They can then watch down on spawn from above and communicate with other police officers on duty down on the floor, and tell them about any potential drug runners, simulating that of a police helicopter. The only way they can get back to spawn is by typing /spawn so that they can't just use the helicopter as a way of gathering drug runners for themselves to arrest, if you know what I mean.
Again, I don't know if this is practical or even a good idea, but it's just something quick I thought of.
There's a little platform about 50 blocks above the spawn floor which only the cops have access to, maybe they can only gain access by typing /warp heli or something like that. They can then watch down on spawn from above and communicate with other police officers on duty down on the floor, and tell them about any potential drug runners, simulating that of a police helicopter. The only way they can get back to spawn is by typing /spawn so that they can't just use the helicopter as a way of gathering drug runners for themselves to arrest, if you know what I mean.
Again, I don't know if this is practical or even a good idea, but it's just something quick I thought of.