We had somewhat of a problem with this, but it was because nobody was clear on what the techs could and couldn't do, because we had so many different levels of techs.... nurse techs, intensive care techs, patient care techs, etc.... and they each have a limit on what tasks they can perform.
They are ALL given a check-off list, in our facility. Anything on their list, they can perform alone, if it has previously been checked off by another RN. And, they are supposed to keep the list readily available, and the RNs are also responsible for reviewing these lists so they will delegate tasks properly. And, of course, NO medication should be given to a patient by anyone but an RN/LPN or a student nurse who is under the supervision of an RN.
Our manager had to bring it up in a staff meeting, to make everyone aware. Maybe that's what needs to be done in your case.