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Thanks again guys, all very helpful.
joko...my sis has stated that she initially called the police for MY sake as I appeared to be having a breakdown and she wanted me taken to a place of safety (even if it WAS a cell). No hint whatsoever that I was attacking my mum. She even told the interviewing police officer that I would never hurt my family. (he was trying to get my sis to say that im violent by nature, something she wasnt happy about)
Will they play the 999 call in court, could be interesting.
I put the knife down several seconds after the police told me to. I initially couldnt understand what the police were telling me to do. They were both shouting and I was in a distressed, confused state and was frightened at what was happening to me. I made no verbal threats to the police, I made no move towards them and the knife was not pointed at them. I had self harmed and had no desire to hurt anyone else. Of course ive got to convince a jury of this which is going to be difficult I think. I will certainley take on board what you say about showing remorse, keeping calm etc. Thank you for your post.