To make Ald-52 one first has to make Lsd-25. The immediate precurser to ald-52 is lsd-25. In addition when ald-52 breaks down with time, moisture, air, heat, or whatever it converts to lsd-25.
Often when those samples were brought to court, they were then lsd. Now days ald-52 is illegal because of the analogue act and the fact you would have to first break the law in making lsd.
The effect of ald-52 is preferable by most over lsd-25. Much more visual with a very comfortable body load. Often when people speak of "fresh acid that was very visual" they are speaking about ald-52. Well that was the case in the early 70's, nowdays it may mean some research chemical.
Om