First, the basic model for your trousers should probably be the Spartan (has corkscrew) or the Tinker (subs a Phillips-head screwdriver for the corkscrew.) These have the basic blades of a Boy Scout knife, plus a toothpick, tweezer, a second blade, and a better can opener. I chose the Spartan because I want a corkscrew and the small screwdriver will usually turn Phillips screws. It's on the can opener blade. The bottle opener blade has the large screwdriver.
If you want a smaller one for dress slacks and you seldom need a can opener, etc., the Executive model is good. The nail file blade can turn some Philips screws, as can the tip of the fruit peeler blade. And its teeth can cut some ropes, etc.
For police duty use, as the OP wants, I'd carry a Spartan in my pocket and a longer one with more tools in a coat pocket or in a briefcase. My briefcase holds a SOS Kit in nice black leather with a SwissChamp.
You may need a saw. The former German Army one has a nice one, with a combo tool on the tip that opens cans and bottles and works as a screwdriver. The saw is larger than on the regular 91mm closed knives, but even that saw, like on the Camper, SwissChamp, etc. is surprisingly effective.
The longer Hunter model is worth a look for a belt pouch or coat pocket. I plan to buy one. I like the roebuck/rhebok head on the handle. I think handles can be either red or green. I want green.
I've carried a SAK since 1966, and have maybe 20 in various models. Which I carry depends on where I'm going and what I'm doing that day.
Many tools serve more than the stated purpose. The corkscrew, for instance, undoes knots. (You may not want to cut something that has a knot in it, like a shoelace.) The corkscrew is useable, but should be regarded as sort of emergency tool if you are somewhere that no one has one.
The corkscrew on the larger German folding hunting knives, like the Puma Models 943 and 959 is a better corkscrew. At home or on picnics, the regular wooden corkscrew with two handles is best. Some corks are pretty stubborn, especially if the wine has been stored upright and the cork has dried out.
But the one on standard size SAK's usually works, if with a bit more effort. The larger one on the former German Army knife is better, and that knife is good to take hiking or on picnics. Be aware that Vic. is only one of several contractors to the Bundswehr. I think their knives are best, but saw one by Robt. Klaas, Kissing Crane brand that was also very good.
Actual German surplus knives are often sold for cheap prices, but may have seen considerable use. Try to see the knife before purchase. Mail orders are just taking pot luck.
CYRANO: The Mauser-marked brand is NOT identical to the German issue knife, which has the Bundswehr eagle on one handle scale. The Mauser model has an added blade. There was also a red one of the German model, made commercially only, as the Safari model. The red scales, like the OD ones on the military and Mauser models, are checkered. The springs are stronger and the knives are larger than the Tinker, etc.
I LOVE SAK's and appreciate them for what they are. If you do a lot of heavy duty cutting, yes, they can dull sooner than a harder steel of different characteristics. It isn't fair to expect a SAK blade to hold an edge as long as a 154CM blade on an expensive custom knife or a high end Benchmade, etc.
You're comparing a $20 knife to a $200 one! And the SAK has more than just cutting blades!
In normal use by someone who isn't an industrial worker who cuts carpet, etc. all day, the SAK blades are fine. And they're sure easier for most people to hone.
I think the true Victorinox brand SAK's are among the world's true best buys, even bargains.
You can see SAK's evaluated on YouTube. You can even take a tour of the factory. But be aware that many making videos know very little of their subject. Many of these ninnies don't know the tool names, or even the purposes! But the better vids are good, and if the video has good resolution, you can see the blades in use and get a look at that knife model.
Swiss Army Brands no longer imports as many models as they did, mainly due to knife regs for airlines and so many workplaces, court houses, etc. You can obtain other models from the actual factory, and import duty is low or none. Address the Export Director there. He has good English, of course.
The address is:
Carl Elsener Messerfabrik/Victorinox
CH-6438
Ibach-Schwyz
Switzerland