is to be stored in a medium security wall safe
medium-security
During training demonstrations
comma after demonstrations.
Copper and human blood are not allowed to be used during research or training under any circumstances, and any individual suspected to be bringing a sample of Copper or human blood is to be searched prior to entering the same room as RPC-XXX.
Run-on sentence. Split these into two sentences by removing the "and", replacing it with a period, and capitalizing "Any".
Copper or
doesn't need to be capitalized.
The anomalous nature of the pencil manifests as the transmutation of
You already explained in the sentence prior the pencil itself is anomalous. Consider the following line:
Notably, RPC-XXX transmutates materials placed into it as a substitute for graphite.
This way your not repeating "anomalous" in a relatively short article.
The materials RPC-XXX has been found to transmute are limited, and in all cases but one have been found to be harmless.
The materials RPC-XXX transmuted* are limited
Additionally, nix "have been found to be" with "are" for the sake of clarity and expediency.
Trainees that have enrolled in the bimonthly Introductory Seminar on Anomalous Objects hosted at Site-016 are given the opportunity to observe demonstrations utilizing RPC-XXX and at the end of the seminar are invited to conduct informal tests while under supervision by research and security personnel.
Run-on sentence. Remove "and" and create a new sentence at "at the end". The new sentence would contain "At the end of the seminar, trainees are invited…"
Interrogation of the employees of the store yielded the information that the pencil had been sitting in the back room for an unknown period of time as it was not the same type as the ones currently for sale, and that none of the employees knew where it came from.
"Interrogations" might not be the appropriate word here given its such a harmless anomaly and the employees weren't withholding information or a threat to the Authority. "Interviews" may be a more appropriate word. Additionally, how was the interrogation conducted if they were already administered amnestics?
I would move this line: "Class A-1 amnestics were used on the local populous, and all newspapers regarding the incident were seized. "
To the bottom of the paragraph.
Remove "the information" as the following fragment can be taken as the information being yielded. Remove "sitting" and replace with "stored" as "sitting" is too non-clinical in tone for an inanimate object. Remove "of time" as "period" expresses everything the reader needs to know without repeating the same meaning.
Once edited, it should resemble the following:
"Interrogation of the employees of the store yielded that the pencil had been stored in the back room for an unknown period. "
I would argue you don't need everything after "unknown period." as the reader can generally gather that on their own.