Theft and disturbance of the peace of home (stöld samt hemfridsbrott)
Lawline svarar
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To uninvited and without permission sneak into someone's room, or house, or to take anothers belongings, are both actions considered to be criminal. The law regulating this matter is called brottsbalken (BrB), and the two types of crime will be elaborated upon separetely in the following.
In regards to sneaking into someone's room without permission what can be said is the following. In 4 chap. 6 § BrB it is stated that a person that without permission enters anothers room will be sentenced as having committed the crime of disturbing the peace of home. The punishment for this crime is feigns, and in severe cases it can be prison for a period of up to two years. As such – what can be concluded is that you're home owner have committed this crime. What you should do in this situation is to contact the police and report the crime.
In terms of taking anothers belonings, with the intention to keep it for one's own usage, the following can be said. This is considered to be theft, and is regarded as a criminal act according to 8 chap. 1 § BrB. The punishment for this crime is at it's heigest, prison for a period of up to two years. What can be concluded is that your home owner is not only commiting the crime of disturbing the peace of home, but is also committing crime of theft. Thus – I also here suggest that you contact the police and explain your issues to them.
The evidence that you've collected will help the police in their investigation – and as such you can be quite convinced that the report you file with the police will result in a conviction.
Though with most certainty the consequence of your decision to file a report with the police will be that you become evicted. Thus I suggest that you firstly secure another living location before you file the report.