Question 1. A citizen suspected of committing a theft from the premises and seized a bunch of keys. To find out whether there is among them a key that allows to open the lock of the room, the investigator made an experiment - in the presence of two citizens tried each of the keys to open the lock. Finding the right key, he secured in the interrogation of these people is a fact.
1) Is the investigator did?
2) What should be the actions of the investigator?
Question 2. Traffic policemen detained for speeding citizen present his driver's license in the name of Nikolayev. Technical passport of the car 2109 was absent, although Nikolaev said that it was his car. During the search of the passenger compartment in the trunk found and seized a knife with a blade switchblade and a plastic bag with a white substance.
Question 3. Dworkin and Sergacheva fraudulently obtained from c. Ropareva 110 thousand. Rubles, promising to find a profitable option exchange his studio. During the investigation the investigator issued Ropar received from Dworkin and Sergacheva warrant for an apartment, an extract from the house, and the financial account, which raise doubts about their authenticity.
1) What types of expertise necessary to appoint an investigator to check the authenticity of these documents?
2) How to obtain samples for a comparative study of the signatures in the documents?
Question 4: At night from the safe office Moscow trade company "Vega" kidnapped revenues of 1mln.125 thousand. Rubles. When viewed from the scene on the door crack a safe found three tracks of fingers. When checking for criminal records found that they belonged previously convicted Sorokin, who lives in Mytischi. During the interrogation, Sorokin said that on the day of the theft was in the city of Penza relatives.
1) How to check the alibi Sorokina?
2) Is there a basis for conducting a search of a residence Sorokina?