A lot of you don't understand the depth of research chemicals. There are at least 15 RC benzodiazepines and a few thienodiazepines that are being pressed into mostly bars and footballs. Most of the time it's not Xanax in the presses because buying clonazolam legally is obviously safer than buying alprazolam powder off of the dark net drug markets. There are also at least 5 fentanyl analogs which are still illegal if the buyer/seller is charged under the analog act. There are people who ship these presses in to sell on the streets by putting acetylfentanyl or carfentanil for example in the presses. These presses are less common but the research chemical benzos that are pressed into bars can be deadly also because for example flubromazolam is very active to a low tolerance user in doses as low as 0.25mg so if they put a few milligrams in the press you will blackout which leads to stealing, crashing your car and potentially killing yourself or someone else. You could wake up somewhere with no recollection of what happened for the past 24 hours or even longer depending on how much they put in the pill. Breaking them up into pieces if it's a bar is unreliable too because 2mg is such a small amount of powder and unlike pharmaceutical companies the powder in the press isn't spread evenly through the filler so half the pill could be inactive. It's really not hard to get tested and verified substances through safer channels.
This is all common sense but I'm writing this for those who don't know the reality of this situation. If you buy bars off of the street you are taking a serious gamble with your health and safety.