Are benzos on the DNMs usually genuine? Has anyone used them to treat a bad LSD trip?

I'm planning to drop some acid soon and I was thinking that having some benzos nearby might be something of a comfort in case I'm worried about a horror trip. I've never taken benzos before so I don't know what they're like.

1: So my first question is, are DNM benzos usually legit? Any way to protect myself from taking dangerous and adulterated knock offs? I worked as LE in a central EU country and have heard of counterfeit drug seizures so I want to avoid those.

2: Have you guys and gals some experience using benzos to cut short a really bad trip? How much and what kind did you take? Did it work? What happened?

Thanks in advance, DNM people! :)