Most of the information you all posted is valid (With exception of the venerable P-3 Orion being a "Maritime Patrol" aircraft. she started her career as a replacement for the P-2 Neptune but sure has evolved into one of the premier 'Eyes in the Sky" of today, check with the Serbs JNA, they know all too well the look down shoot down and over the horizon capabilities of the 3 series of aircraft
On the other hand, unless the US cooperate in lending one for surveillance, they are not for sale (the E series) Cobra got the tech specs better than I can, the Tucano is more than capable for it's mission, BUT! And a big but Give me a Piper Cub and an AK 47 and I will interdict and disable anything the druggies are using, IF I have airborne surveillance vectoring me for a head on meeting with the runner
No matter the speed of the aircraft (Unless you can afford a wing of Raptors, or such, you are not going to catch drug runners by chasing them, by the time you get the angle on the dangle from chase platform based RADAR it is way too late and you will be playing catch up all day
The Tucano has unbelievable loiter time, great pursuit, easy maintenance and FLIR which is very effective in picking out ground target sand if you get lucky, a drug runner in front of you. The Tucanos can loiter at 10000 and develop huge amounts energy in angling toward a suspected runner.
Its ALL in the surveillance, the USA can't even grab runners busting our ADIZ with most sophisticated stuff in the world, without a dedicated Airborne bird it's a guessing game
The price of the Tucano seems out of line, but that could be a price for not only the planes, but engines years of maintenance and ongoing upgrades Someone mentioned an F 16? If the druggies are flying Vipers, you have more problems than you will ever solve Robert, in a nutshell; the Tucanos are excellent for this purpose, the pricing I have no idea about