I don't mind calling balls and strikes on who is doping based on connections to known dopers and statistical trends. Just my thoughts on the top men's 800 runners:
Sedjati: Other than being Algerian and really fast, there is nothing that jumps out on his performances that would indicate doping. The fact that so little is known about a guy who is the best in the freaking world is also amazing. More likely to be doping than not, but I'm not confident about that. 60% chance he's doping.
Wanyonyi: If he is really 19, that means he ran 1:43.xx at 16! He could just be really talented, but he is coached by a known Italian doping coach. I think he's both older than 19 and also doping. 100%.
Tual: Hilariously, blantatly doping in a home Olympic year. 100%.
Attaoui: Still only 22, but just has had an absolute rapid progression. Barely under 1:47 two years ago and barely under 1:53 three years ago. Moroccan Spaniards also don't have a good track record. 100%.
Cheminingwa: Coming out of literally nowhere at 26 in an Olympic year to run world class times and not a lot is known about him. Same coach as Mary Morra in Alex Sang, who doesn't have any particular connections to doping and has been outspoke about Kenya cracking down on doping. 40%.
Pattison: Breakthrough year at 22 and was even bronze medalist last year. This guy is a talent, running sub-1:47 at 17. No known doping connections. 10%.
Crestan: Lots of races under his belt over the years and is 25 and didn't come anywhere close to these performances. His Belgian coach has "discovered" Ethiopians and coached them to fast times. 80%.
Kidali: Young guy at 21 without a lot of experience, but won Kenyan trials. Just as likely or not likely as anyone else to be doping, which I put at a generic 30%.
That then puts us on a tier of Hoppel, Arop, Kramer, Kessler, Miller. These guys are as clean as I think anyone can be. 10%. Below that, Habz is definitely a doper, and then there is really nobody else with a standout enough performance to warrant suspicion.