In To Kill A Mockingbird, what is a quote that proves that Tom Robinson was not involved in the murder because he is not left-handed?

The quotes to prove this fact come mainly during Tom's trial, when Atticus builds his case to proves tom's innocence. At one point, Atticus has Tom stand to reveal his stunted left arm, which is not functional and therefore proves Tom is not left-handed. Based on the evidence, Tom could not have been responsible for Mayella's injuries.

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The answer to this question depends on three quotes regarding three different witnesses at the trial.

First, Heck Tate testifies about Mayella's injuries:

Something had been made plain to Atticus also, and it brought him to his feet. “Sheriff, please repeat what you said.”

“It was her right eye, I said.”

“No…” Atticus walked to the court reporter’s desk and bent down to the furiously scribbling hand. It stopped, flipped back the shorthand pad, and the court reporter said, “‘Mr. Finch. I remember now she was banged up on that side of the face.’”

Atticus looked up at Mr. Tate. “Which side again, Heck?”

“The right side, Mr. Finch, but she had more bruises—you wanta hear about ‘em?”

Atticus seemed to be bordering on another question, but he thought better of it and said, “Yes, what were her other injuries?” As Mr. Tate answered, Atticus turned and looked at Tom Robinson as if to say this was something they hadn’t bargained for.

“…her arms were bruised, and she showed me her neck. There were definite finger marks on her gullet—”

“All around her throat? At the back of her neck?”

“I’d say they were all around, Mr. Finch.”

“You would?”

“Yes sir, she had a small throat..."

Through this testimony, we know first that Mayella's injuries were inflicted to the right side of her face, indicating that a left-handed person had thrown those punches. We also learn that she had marks "all around" her throat, indicating someone had tried to choke her.

Then we learn something interesting about Mayella's father at the end of his testimony:

Mr. Ewell wrote on the back of the envelope and looked up complacently to see Judge Taylor staring at him as if he were some fragrant gardenia in full bloom on the witness stand, to see Mr. Gilmer half-sitting, half-standing at his table. The jury was watching him, one man was leaning forward with his hands over the railing.

“What’s so interestin‘?” he asked.

“You’re left-handed, Mr. Ewell,” said Judge Taylor. Mr. Ewell turned angrily to the judge and said he didn’t see what his being left-handed had to do with it.

This raises suspicion about Mr. Ewell's involvement and sheds further doubt on his credibility. The fact that he is left-handed makes him a possible suspect for the violence against Mayella.

This possibility is solidified during Mayella's testimony. Atticus asks Mayella to identify the man who assaulted her, and she points to Tom. An interesting development occurs at this point:

Tom Robinson’s powerful shoulders rippled under his thin shirt. He rose to his feet and stood with his right hand on the back of his chair. He looked oddly off balance, but it was not from the way he was standing. His left arm was fully twelve inches shorter than his right, and hung dead at his side. It ended in a small shriveled hand, and from as far away as the balcony I could see that it was no use to him.

Tom could not have inflicted the bruises on the right side of Mayella's face because he cannot use his left arm. Further, he could not have left marks of choking her "all around" her neck because he lacks one hand that could have made that full circle.

Therefore, the cumulative evidence points not to Tom as the man who assaulted Mayella, but to her own father, a left-handed and exceedingly violent man.

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While Mayella is testifying that Tom Robinson assaulted and raped her, Atticus asks Mayella to identify her perpetrator. Scout recalls seeing Tom Robinson stand up for the first time and notices his obvious handicap. Scout says,

"He looked oddly off balance, but it was not from the way he was standing. His left arm was fully twelve inches shorter than his right, and hung dead at his side. It ended in a small shriveled hand, and from as far away as the balcony I could see that it was no use to him." (Lee, 188) 

The audience and the community of Maycomb know that Tom Robinson cannot use his left hand at all. The fact that Mayella was beaten predominately on the right side of her face indicates that the perpetrator lead almost exclusively with his left hand. Mayella also had bruises the entire way around her neck, which means that somebody with two good hands must have choked her. All of the circumstantial evidence suggests that Tom Robinson is innocent and that Mayella's father, instead, assaulted his daughter.

During Atticus's closing remarks, he mentions that this case is as simple as black and white and explains Mayella's reasoning for accusing Tom Robinson of rape. Atticus then mentions the evidence which suggests that Bob Ewell assaulted his daughter, given the fact that he is left-handed and Tom Robinson is handicapped. Atticus tells the jury,

"We don’t know, but there is circumstantial evidence to indicate that Mayella Ewell was beaten savagely by someone who led almost exclusively with his left." (208)

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Tom Robinson could not have beaten up Mayella Ewell because he is crippled on his left side.

Early in the trial, Atticus establishes that Mayella was attacked by a left handed person, and that Bob Ewell is indeed left handed.

Atticus was trying to show… that Mr. Ewell could have beaten up Mayella. …If her right eye was blacked and she was beaten mostly on the right side of the face, it would tend to show that a left-handed person did it. (ch 17)

Scout is not impressed.  She figures that Tom Robinson could just as easily be left handed, and then there is no reason for all of the fuss.  After all, she is a child.  She can follow most of the proceedings, but she does not see the bigger picture.

We see that Tom Robinson is crippled when they try to swear him in and he can’t keep his left hand on the Bible.

Thomas Robinson reached around, ran his fingers under his left arm and lifted it. He guided his arm to the Bible and his rubber-like left hand sought contact with the black binding. As he raised his right hand, the useless one slipped off the Bible and hit the clerk's table. (ch 19)

Tom could not possibly have attacked Mayella Ewell.  Since Atticus went to so much trouble to demonstrate that she was attacked by a left handed person, it did not take much to get the jury’s attention when they saw that Tom could not use his left hand.

Unfortunately, being physically unable to commit the crime was not enough for the jury.  It was still a black man’s word against a white woman’s.

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