English term
Russian Federation
also an engineer
Native in: Russian
Works in: English to Russian, Russian to English
обученные правилам безопасного труда в химической лаборатории.
Non-PRO (1): Erzsébet Czopyk
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Proposed translations
United States
English -> Russian
Native in: Russian (Variant: Standard-Russia)
Works in: English to Russian, Russian to English, English, and 1 more.
who received chemical laboratoty safety training
https://sc.edu/study/colleges_schools/chemistry_and_biochemi...
Ukraine
a top-rank. native English-Ukrainian-Rus
Native in: English (Variant: US) 
, Ukrainian (Variant: Standard-Ukraine) 
, Russian
Works in: English to Ukrainian, Ukrainian to English, Russian to English, and 3 more.
trained in the chemistry lab safety measures
Laboratory Chemical Safety Training ... of a hazardous chemical and measures to protect against these hazards, including appropriate work practices, ... https://ehs.yale.edu/trainings/laboratory-chemical-training
Kyrgyzstan
Education, Legal, Technical & Medical
Native in: Uzbek (Variants: Samarkand-Bukhara, Khorezm, Tashkent, Ferghana valley) , Kirghiz
Works in: English to Uzbek, English to Kirghiz, English to Kazakh, and 26 more.
who are trained in Lab safety / who underwent Lab safety training
who are trained means who underwent training and ready for the work in a Lab (more specific here, not just received, but completed properly and they are ready) or underwent and completed also could give the same wording of complete action.
who are trained in Lab safety / who underwent (completed) Lab safety training
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Note added at 9 hrs (2018-06-16 16:54:34 GMT)
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https://www.google.com/search?biw=1920&bih=923&ei=TD8lW9uPE4...
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Note added at 9 hrs (2018-06-16 17:00:37 GMT)
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who are trained in Lab safety-here I mean by "Lab safety" as "Lab safety area-that involves lab safety labour regulations
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Note added at 9 hrs (2018-06-16 17:11:16 GMT)
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Я бы еще добавил "specially", изходя из контекста,
who are trained in Lab safety
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Note added at 9 hrs (2018-06-16 17:11:55 GMT)
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who are specially trained in Lab safety
Ukraine
Quod quisquis norit in hoc se exerceat
Native in: Russian (Variant: Standard-Russia) , Ukrainian (Variant: Standard-Ukraine)
Works in: English to Russian, Spanish to Russian, Portuguese to Russian, and 5 more.
trained in laboratory safety procedures
https://www.mrcgene.com/terms-and-conditions
Или тут:
http://www.cffet.net/worksys/WS3.pdf
Discussion
"who are trained" in the Lab Safety
If we say "received the traing", it does not convey the meaning completely,
but "who are trained" has stronger meaning and has difference or shade between them.
(Or who properly completed the Lab Safety rule of procedures.)