The Short Answer Is “Yes”.
Both Delta 8 and Delta 10 are Tetrahydrocannabinols, and both are illegal in Pennsylvania. Even if the Delta 8 or Delta 10 are derived from hemp, and not marijuana, the compounds are illegal because the entire category of Tetrahydrocannabinols, most commonly referred to as THC, is illegal in Pennsylvania. THC is listed as a scheduled substance in Pa. Code 25.72 (b)(3)(xvi). Most people think just Delta 9 is illegal, but legally Delta 8, 9, and 10 are the same. They are all currently illegal.
Many people only think of Delta 9 as being illegal because that is the compound they are taught that gets you “high”. But, legally, Delta 8, 9 and 10 are considered the same substance and all are equally illegal.
Because Delta 9 is the the compound always referred to in the media, people may think that since Delta 8 and Delta 10 can be possessed or sold legally. That is NOT correct. Any merchant that sells products with Delta 8 or 10 in them is committing a felony, and the people who buy those products are committing misdemeanor crimes just by possessing them.
The defenses to charges involving Delta 8 or Delta 10 are numerous, especially when it comes to the testing used to determine the presence of Delta 8 or 10. As a criminal defense lawyer I highly recommend that if you are a store owner you stop selling these products. If you are a consumer of these products, I strongly suggest you no longer purchase them. Until marijuana and THC are legalized in Pennsylvania as they have been in many other states, you will be in danger of criminal charges.