Tim, who is not a doctor or medically qualified, provided a range of cosmetic procedures at his clinic for clients. Both Sue and Lin, believing that Tim was medically qualified to administer Botox injections, registered with his clinic to undergo a facial procedure. Shortly after she was injected with Botox, Sue suffered a severe reaction to the injection, including a loss of sensation on the left side of her face that persisted for three months.

Lin suffered from partial paralysis in her facial muscles and a drooping eyelid that lasted for a week after Tim administered the Botox injection. Before administering the injection, Tim assured Lin he was a qualified surgeon when she asked if he was medically trained to carry out such a procedure. Evidence adduced at Tim's trial indicated that he was under the influence of alcohol at the time he administered the Botox injections to both Sue and Lin.

Discuss Tim's criminal liability, if any.

Please describe up to one thousand five hundred words. please insert relevant cases. thank you.