but that is meaning there is not ability to work in labor law to employees which are not good in Latvian language
Absolutely. If you don't know Latvian, if you are not a citizen of Latvia, and if you don't have the Latvian education in law - most likely you won't be allowed to work in this area. I know some lawyers which graduated in US, and they maybe working in the collaborative (LV<->US) companies as consultants. However you must have lots of contacts and trust amongst Latvian partners to work that way. It's not the door opened to everybody.
Here is some information (in Latvian) on the National Center for Education
which you may translate using Google translator to see what kind of exams and conditions you should met before you get the "passport", i.e. certificate of proficiency (apliecība).
Here are some excerpts from this article (which is not available in English on their website, unfortunately):The language test
The language proficiency test is to assess the person's state (Latvian) language skills.
If the language test is passed successfully, the person receives a certificate of proficiency.
State language certificate is required:
- for work,
- a permanent residence permit
- The European Union's permanent resident status.
The language proficiency test provided by the Latvian Ministry of Education and Science (MES), the State Education Centre (SECC), the state language examination department.
The language proficiency test proficiency test panel.
Mailing address: Valnu street 2 (606th cabinet), Riga, LV-1050
Phone: 67814480, 67281232
Latvian is a set of three proficiency levels:
basic or level A
average or Level B,
Level C or higher.
Each level has two stages:
First - Lower degree;
Second - The highest level.