Most likely charged as an adult. They need attorneys before the police catch them.
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It will most likely be charged as a juvenile case. However, the prosecutor may request that the case be prosecuted as an adult case. Depending on the severity of the confrontation during the robbery, whether people were in the house when the robbery occurred, whether anyone was injured, etc., all these factors may affect whether kids will be prosecuted as adults. I suggest you contact local attorney, call or email and I can answer some few questions for you. Good luck.
The general rule is that the individual would be charged according to his status when the crime was committed, not when the crime was discovered. This is loosely analogous to the general requirement that courts apply the statutes and penalty provisions that existed at the time a crime was committed. However, it is also true that the prosecutor may file a motion to waive the individuals to adult status based on statutory factors including the severity of the offense, whether or not the offense would constitute a 'person' crime if commmitted by an adult, whether or not the individuals have prior juvenile adjudications, and the age of the individual. At age 18, it is likely that there are comparatively fewer available resources in the juvenile system. Definitely contact a criminal defense attorney with experience in the juvenile system.